5 * Wireshark - Network traffic analyzer
6 * By Gerald Combs <gerald@wireshark.org>
7 * Copyright 1998 Gerald Combs
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 #include <stdlib.h> /* for exit() */
33 #ifdef HAVE_SYS_TYPES_H
34 # include <sys/types.h>
37 #ifdef HAVE_SYS_SOCKET_H
38 #include <sys/socket.h>
41 #ifdef HAVE_NETINET_IN_H
42 #include <netinet/in.h>
45 #ifdef HAVE_SYS_STAT_H
46 # include <sys/stat.h>
57 #ifdef HAVE_ARPA_INET_H
58 #include <arpa/inet.h>
61 #if defined(__APPLE__) && defined(__LP64__)
62 #include <sys/utsname.h>
69 #include "wsutil/wsgetopt.h"
77 # include <sys/prctl.h>
78 # include <sys/capability.h>
81 #include "ringbuffer.h"
82 #include "clopts_common.h"
83 #include "console_io.h"
84 #include "cmdarg_err.h"
85 #include "version_info.h"
87 #include "capture-pcap-util.h"
89 #include "capture-wpcap.h"
95 #include "capture-wpcap.h"
96 #include <wsutil/unicode-utils.h>
103 #ifdef NEED_INET_V6DEFS_H
104 # include "wsutil/inet_v6defs.h"
107 #include <wsutil/privileges.h>
109 #include "sync_pipe.h"
111 #include "capture_opts.h"
112 #include "capture_ifinfo.h"
113 #include "capture_sync.h"
115 #include "conditions.h"
116 #include "capture_stop_conditions.h"
118 #include "tempfile.h"
120 #include "wsutil/file_util.h"
122 #include "ws80211_utils.h"
125 * Get information about libpcap format from "wiretap/libpcap.h".
126 * XXX - can we just use pcap_open_offline() to read the pipe?
128 #include "wiretap/libpcap.h"
130 /**#define DEBUG_DUMPCAP**/
131 /**#define DEBUG_CHILD_DUMPCAP**/
135 #include <conio.h> /* _getch() */
139 #ifdef DEBUG_CHILD_DUMPCAP
140 FILE *debug_log; /* for logging debug messages to */
141 /* a file if DEBUG_CHILD_DUMPCAP */
145 static GAsyncQueue *pcap_queue;
146 static gint64 pcap_queue_bytes;
147 static gint64 pcap_queue_packets;
148 static gint64 pcap_queue_byte_limit = 1024 * 1024;
149 static gint64 pcap_queue_packet_limit = 1000;
151 static gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
153 static gchar *sig_pipe_name = NULL;
154 static HANDLE sig_pipe_handle = NULL;
155 static gboolean signal_pipe_check_running(void);
159 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
160 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
163 /** Stop a low-level capture (stops the capture child). */
164 static void capture_loop_stop(void);
165 /** Close a pipe, or socket if \a from_socket is TRUE */
166 static void cap_pipe_close(int pipe_fd, gboolean from_socket _U_);
168 #if !defined (__linux__)
169 #ifndef HAVE_PCAP_BREAKLOOP
171 * We don't have pcap_breakloop(), which is the only way to ensure that
172 * pcap_dispatch(), pcap_loop(), or even pcap_next() or pcap_next_ex()
173 * won't, if the call to read the next packet or batch of packets is
174 * is interrupted by a signal on UN*X, just go back and try again to
177 * On UN*X, we catch SIGINT as a "stop capturing" signal, and, in
178 * the signal handler, set a flag to stop capturing; however, without
179 * a guarantee of that sort, we can't guarantee that we'll stop capturing
180 * if the read will be retried and won't time out if no packets arrive.
182 * Therefore, on at least some platforms, we work around the lack of
183 * pcap_breakloop() by doing a select() on the pcap_t's file descriptor
184 * to wait for packets to arrive, so that we're probably going to be
185 * blocked in the select() when the signal arrives, and can just bail
186 * out of the loop at that point.
188 * However, we don't want to do that on BSD (because "select()" doesn't work
189 * correctly on BPF devices on at least some releases of some flavors of
190 * BSD), and we don't want to do it on Windows (because "select()" is
191 * something for sockets, not for arbitrary handles). (Note that "Windows"
192 * here includes Cygwin; even in its pretend-it's-UNIX environment, we're
193 * using WinPcap, not a UNIX libpcap.)
195 * Fortunately, we don't need to do it on BSD, because the libpcap timeout
196 * on BSD times out even if no packets have arrived, so we'll eventually
197 * exit pcap_dispatch() with an indication that no packets have arrived,
198 * and will break out of the capture loop at that point.
200 * On Windows, we can't send a SIGINT to stop capturing, so none of this
201 * applies in any case.
203 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
204 * want to include it if it's not present on this platform, however.
206 # if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
207 !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
209 # define MUST_DO_SELECT
210 # endif /* avoid select */
211 #endif /* HAVE_PCAP_BREAKLOOP */
213 /* whatever the deal with pcap_breakloop, linux doesn't support timeouts
214 * in pcap_dispatch(); on the other hand, select() works just fine there.
215 * Hence we use a select for that come what may.
217 #define MUST_DO_SELECT
220 /** init the capture filter */
223 INITFILTER_BAD_FILTER,
224 INITFILTER_OTHER_ERROR
225 } initfilter_status_t;
227 typedef struct _pcap_options {
231 #ifdef MUST_DO_SELECT
232 int pcap_fd; /* pcap file descriptor */
239 gboolean ts_nsec; /* TRUE if we're using nanosecond precision. */
240 /* capture pipe (unix only "input file") */
241 gboolean from_cap_pipe; /* TRUE if we are capturing data from a capture pipe */
242 gboolean from_cap_socket; /* TRUE if we're capturing from socket */
243 struct pcap_hdr cap_pipe_hdr; /* Pcap header when capturing from a pipe */
244 struct pcaprec_modified_hdr cap_pipe_rechdr; /* Pcap record header when capturing from a pipe */
246 HANDLE cap_pipe_h; /* The handle of the capture pipe */
248 int cap_pipe_fd; /* the file descriptor of the capture pipe */
249 gboolean cap_pipe_modified; /* TRUE if data in the pipe uses modified pcap headers */
250 gboolean cap_pipe_byte_swapped; /* TRUE if data in the pipe is byte swapped */
252 char * cap_pipe_buf; /* Pointer to the data buffer we read into */
254 int cap_pipe_bytes_to_read;/* Used by cap_pipe_dispatch */
255 int cap_pipe_bytes_read; /* Used by cap_pipe_dispatch */
257 STATE_EXPECT_REC_HDR,
262 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } cap_pipe_err;
264 GMutex *cap_pipe_read_mtx;
265 GAsyncQueue *cap_pipe_pending_q, *cap_pipe_done_q;
269 typedef struct _loop_data {
271 gboolean go; /* TRUE as long as we're supposed to keep capturing */
272 int err; /* if non-zero, error seen while capturing */
273 gint packet_count; /* Number of packets we have already captured */
274 gint packet_max; /* Number of packets we're supposed to capture - 0 means infinite */
275 guint inpkts_to_sync_pipe; /* Packets not already send out to the sync_pipe */
277 gboolean report_packet_count; /* Set by SIGINFO handler; print packet count */
284 guint32 autostop_files;
287 typedef struct _pcap_queue_element {
288 pcap_options *pcap_opts;
289 struct pcap_pkthdr phdr;
291 } pcap_queue_element;
294 * Standard secondary message for unexpected errors.
296 static const char please_report[] =
297 "Please report this to the Wireshark developers.\n"
298 "(This is not a crash; please do not report it as such.)";
301 * This needs to be static, so that the SIGINT handler can clear the "go"
304 static loop_data global_ld;
308 * Timeout, in milliseconds, for reads from the stream of captured packets
309 * from a capture device.
311 * A bug in Mac OS X 10.6 and 10.6.1 causes calls to pcap_open_live(), in
312 * 64-bit applications, with sub-second timeouts not to work. The bug is
313 * fixed in 10.6.2, re-broken in 10.6.3, and again fixed in 10.6.5.
315 #if defined(__APPLE__) && defined(__LP64__)
316 static gboolean need_timeout_workaround;
318 #define CAP_READ_TIMEOUT (need_timeout_workaround ? 1000 : 250)
320 #define CAP_READ_TIMEOUT 250
324 * Timeout, in microseconds, for reads from the stream of captured packets
325 * from a pipe. Pipes don't have the same problem that BPF devices do
326 * in OS X 10.6, 10.6.1, 10.6.3, and 10.6.4, so we always use a timeout
327 * of 250ms, i.e. the same value as CAP_READ_TIMEOUT when not on one
328 * of the offending versions of Snow Leopard.
330 * On Windows this value is converted to milliseconds and passed to
331 * WaitForSingleObject. If it's less than 1000 WaitForSingleObject
332 * will return immediately.
335 #define PIPE_READ_TIMEOUT 100000
337 #define PIPE_READ_TIMEOUT 250000
340 #define WRITER_THREAD_TIMEOUT 100000 /* usecs */
343 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
344 const char *message, gpointer user_data _U_);
346 /* capture related options */
347 static capture_options global_capture_opts;
348 static gboolean quiet = FALSE;
349 static gboolean use_threads = FALSE;
350 static guint64 start_time;
352 static void capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
354 static void capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
356 static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
357 int err, gboolean is_close);
359 static void WS_MSVC_NORETURN exit_main(int err) G_GNUC_NORETURN;
361 static void report_new_capture_file(const char *filename);
362 static void report_packet_count(unsigned int packet_count);
363 static void report_packet_drops(guint32 received, guint32 drops, gchar *name);
364 static void report_capture_error(const char *error_msg, const char *secondary_error_msg);
365 static void report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg);
367 #define MSG_MAX_LENGTH 4096
369 /* Copied from pcapio.c libpcap_write_interface_statistics_block()*/
371 create_timestamp(void) {
381 * Current time, represented as 100-nanosecond intervals since
382 * January 1, 1601, 00:00:00 UTC.
384 * I think DWORD might be signed, so cast both parts of "now"
385 * to guint32 so that the sign bit doesn't get treated specially.
387 * Windows 8 provides GetSystemTimePreciseAsFileTime which we
388 * might want to use instead.
390 GetSystemTimeAsFileTime(&now);
391 timestamp = (((guint64)(guint32)now.dwHighDateTime) << 32) +
392 (guint32)now.dwLowDateTime;
395 * Convert to same thing but as 1-microsecond, i.e. 1000-nanosecond,
401 * Subtract difference, in microseconds, between January 1, 1601
402 * 00:00:00 UTC and January 1, 1970, 00:00:00 UTC.
404 timestamp -= G_GINT64_CONSTANT(11644473600000000U);
407 * Current time, represented as seconds and microseconds since
408 * January 1, 1970, 00:00:00 UTC.
410 gettimeofday(&now, NULL);
413 * Convert to delta in microseconds.
415 timestamp = (guint64)(now.tv_sec) * 1000000 +
416 (guint64)(now.tv_usec);
422 print_usage(gboolean print_ver)
429 "Dumpcap " VERSION "%s\n"
430 "Capture network packets and dump them into a pcapng file.\n"
431 "See http://www.wireshark.org for more information.\n",
432 wireshark_svnversion);
436 fprintf(output, "\nUsage: dumpcap [options] ...\n");
437 fprintf(output, "\n");
438 fprintf(output, "Capture interface:\n");
439 fprintf(output, " -i <interface> name or idx of interface (def: first non-loopback),\n"
440 " or for remote capturing, use one of these formats:\n"
441 " rpcap://<host>/<interface>\n"
442 " TCP@<host>:<port>\n");
443 fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
444 fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
445 fprintf(output, " -p don't capture in promiscuous mode\n");
446 #ifdef HAVE_PCAP_CREATE
447 fprintf(output, " -I capture in monitor mode, if available\n");
449 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
450 fprintf(output, " -B <buffer size> size of kernel buffer (def: 1MB)\n");
452 fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
453 fprintf(output, " -D print list of interfaces and exit\n");
454 fprintf(output, " -L print list of link-layer types of iface and exit\n");
455 #ifdef HAVE_BPF_IMAGE
456 fprintf(output, " -d print generated BPF code for capture filter\n");
458 fprintf(output, " -k set channel on wifi interface <freq>,[<type>]\n");
459 fprintf(output, " -S print statistics for each interface once per second\n");
460 fprintf(output, " -M for -D, -L, and -S, produce machine-readable output\n");
461 fprintf(output, "\n");
462 #ifdef HAVE_PCAP_REMOTE
463 fprintf(output, "RPCAP options:\n");
464 fprintf(output, " -r don't ignore own RPCAP traffic in capture\n");
465 fprintf(output, " -u use UDP for RPCAP data transfer\n");
466 fprintf(output, " -A <user>:<password> use RPCAP password authentication\n");
467 #ifdef HAVE_PCAP_SETSAMPLING
468 fprintf(output, " -m <sampling type> use packet sampling\n");
469 fprintf(output, " count:NUM - capture one packet of every NUM\n");
470 fprintf(output, " timer:NUM - capture no more than 1 packet in NUM ms\n");
473 fprintf(output, "Stop conditions:\n");
474 fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
475 fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
476 fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
477 fprintf(output, " files:NUM - stop after NUM files\n");
478 /*fprintf(output, "\n");*/
479 fprintf(output, "Output (files):\n");
480 fprintf(output, " -w <filename> name of file to save (def: tempfile)\n");
481 fprintf(output, " -g enable group read access on the output file(s)\n");
482 fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
483 fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
484 fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
485 fprintf(output, " -n use pcapng format instead of pcap (default)\n");
486 fprintf(output, " -P use libpcap format instead of pcapng\n");
487 fprintf(output, "\n");
488 fprintf(output, "Miscellaneous:\n");
489 fprintf(output, " -t use a separate thread per interface\n");
490 fprintf(output, " -q don't report packet capture counts\n");
491 fprintf(output, " -v print version information and exit\n");
492 fprintf(output, " -h display this help and exit\n");
493 fprintf(output, "\n");
494 fprintf(output, "Example: dumpcap -i eth0 -a duration:60 -w output.pcapng\n");
495 fprintf(output, "\"Capture packets from interface eth0 until 60s passed into output.pcapng\"\n");
496 fprintf(output, "\n");
497 fprintf(output, "Use Ctrl-C to stop capturing at any time.\n");
501 show_version(GString *comp_info_str, GString *runtime_info_str)
504 "Dumpcap " VERSION "%s\n"
509 "See http://www.wireshark.org for more information.\n",
510 wireshark_svnversion, get_copyright_info() ,comp_info_str->str, runtime_info_str->str);
514 * Print to the standard error. This is a command-line tool, so there's
515 * no need to pop up a console.
518 vfprintf_stderr(const char *fmt, va_list ap)
520 vfprintf(stderr, fmt, ap);
524 fprintf_stderr(const char *fmt, ...)
529 vfprintf_stderr(fmt, ap);
534 * Report an error in command-line arguments.
537 cmdarg_err(const char *fmt, ...)
543 /* Generate a 'special format' message back to parent */
545 msg = g_strdup_vprintf(fmt, ap);
546 sync_pipe_errmsg_to_parent(2, msg, "");
551 fprintf(stderr, "dumpcap: ");
552 vfprintf(stderr, fmt, ap);
553 fprintf(stderr, "\n");
559 * Report additional information for an error in command-line arguments.
562 cmdarg_err_cont(const char *fmt, ...)
569 msg = g_strdup_vprintf(fmt, ap);
570 sync_pipe_errmsg_to_parent(2, msg, "");
575 vfprintf(stderr, fmt, ap);
576 fprintf(stderr, "\n");
583 #if 0 /* Set to enable capability debugging */
584 /* see 'man cap_to_text()' for explanation of output */
585 /* '=' means 'all= ' ie: no capabilities */
586 /* '=ip' means 'all=ip' ie: all capabilities are permissible and inheritable */
588 print_caps(const char *pfx) {
589 cap_t caps = cap_get_proc();
590 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
591 "%s: EUID: %d Capabilities: %s", pfx,
592 geteuid(), cap_to_text(caps, NULL));
595 print_caps(const char *pfx _U_) {
600 relinquish_all_capabilities(void)
602 /* Drop any and all capabilities this process may have. */
603 /* Allowed whether or not process has any privileges. */
604 cap_t caps = cap_init(); /* all capabilities initialized to off */
605 print_caps("Pre-clear");
606 if (cap_set_proc(caps)) {
607 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
609 print_caps("Post-clear");
615 open_capture_device(interface_options *interface_opts,
616 char (*open_err_str)[PCAP_ERRBUF_SIZE])
619 #ifdef HAVE_PCAP_CREATE
622 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
623 struct pcap_rmtauth auth;
626 /* Open the network interface to capture from it.
627 Some versions of libpcap may put warnings into the error buffer
628 if they succeed; to tell if that's happened, we have to clear
629 the error buffer, and check if it's still a null string. */
630 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Entering open_capture_device().");
631 (*open_err_str)[0] = '\0';
632 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
634 * If we're opening a remote device, use pcap_open(); that's currently
635 * the only open routine that supports remote devices.
637 if (strncmp (interface_opts->name, "rpcap://", 8) == 0) {
638 auth.type = interface_opts->auth_type == CAPTURE_AUTH_PWD ?
639 RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
640 auth.username = interface_opts->auth_username;
641 auth.password = interface_opts->auth_password;
643 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
644 "Calling pcap_open() using name %s, snaplen %d, promisc_mode %d, datatx_udp %d, nocap_rpcap %d.",
645 interface_opts->name, interface_opts->snaplen, interface_opts->promisc_mode,
646 interface_opts->datatx_udp, interface_opts->nocap_rpcap);
647 pcap_h = pcap_open(interface_opts->name, interface_opts->snaplen,
649 (interface_opts->promisc_mode ? PCAP_OPENFLAG_PROMISCUOUS : 0) |
650 (interface_opts->datatx_udp ? PCAP_OPENFLAG_DATATX_UDP : 0) |
651 (interface_opts->nocap_rpcap ? PCAP_OPENFLAG_NOCAPTURE_RPCAP : 0),
652 CAP_READ_TIMEOUT, &auth, *open_err_str);
653 if (pcap_h == NULL) {
654 /* Error - did pcap actually supply an error message? */
655 if ((*open_err_str)[0] == '\0') {
656 /* Work around known WinPcap bug wherein no error message is
657 filled in on a failure to open an rpcap: URL. */
658 g_strlcpy(*open_err_str,
659 "Unknown error (pcap bug; actual error cause not reported)",
660 sizeof *open_err_str);
663 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
664 "pcap_open() returned %p.", (void *)pcap_h);
669 * If we're not opening a remote device, use pcap_create() and
670 * pcap_activate() if we have them, so that we can set the buffer
671 * size, otherwise use pcap_open_live().
673 #ifdef HAVE_PCAP_CREATE
674 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
675 "Calling pcap_create() using %s.", interface_opts->name);
676 pcap_h = pcap_create(interface_opts->name, *open_err_str);
677 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
678 "pcap_create() returned %p.", (void *)pcap_h);
679 if (pcap_h != NULL) {
680 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
681 "Calling pcap_set_snaplen() with snaplen %d.", interface_opts->snaplen);
682 pcap_set_snaplen(pcap_h, interface_opts->snaplen);
683 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
684 "Calling pcap_set_promisc() with promisc_mode %d.", interface_opts->promisc_mode);
685 pcap_set_promisc(pcap_h, interface_opts->promisc_mode);
686 pcap_set_timeout(pcap_h, CAP_READ_TIMEOUT);
688 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
689 "buffersize %d.", interface_opts->buffer_size);
690 if (interface_opts->buffer_size != 0) {
691 pcap_set_buffer_size(pcap_h, interface_opts->buffer_size * 1024 * 1024);
693 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
694 "monitor_mode %d.", interface_opts->monitor_mode);
695 if (interface_opts->monitor_mode)
696 pcap_set_rfmon(pcap_h, 1);
697 err = pcap_activate(pcap_h);
698 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
699 "pcap_activate() returned %d.", err);
701 /* Failed to activate, set to NULL */
702 if (err == PCAP_ERROR)
703 g_strlcpy(*open_err_str, pcap_geterr(pcap_h), sizeof *open_err_str);
705 g_strlcpy(*open_err_str, pcap_statustostr(err), sizeof *open_err_str);
711 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
712 "pcap_open_live() calling using name %s, snaplen %d, promisc_mode %d.",
713 interface_opts->name, interface_opts->snaplen, interface_opts->promisc_mode);
714 pcap_h = pcap_open_live(interface_opts->name, interface_opts->snaplen,
715 interface_opts->promisc_mode, CAP_READ_TIMEOUT,
717 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
718 "pcap_open_live() returned %p.", (void *)pcap_h);
721 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "open_capture_device %s : %s", pcap_h ? "SUCCESS" : "FAILURE", interface_opts->name);
726 get_capture_device_open_failure_messages(const char *open_err_str,
732 char *errmsg, size_t errmsg_len,
733 char *secondary_errmsg,
734 size_t secondary_errmsg_len)
737 const char *libpcap_warn;
738 static const char ppamsg[] = "can't find PPA for ";
741 g_snprintf(errmsg, (gulong) errmsg_len,
742 "The capture session could not be initiated (%s).", open_err_str);
745 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
747 "In order to capture packets, WinPcap must be installed; see\n"
749 " http://www.winpcap.org/\n"
753 " http://www.mirrors.wiretapped.net/security/packet-capture/winpcap/\n"
757 " http://winpcap.cs.pu.edu.tw/\n"
759 "for a downloadable version of WinPcap and for instructions on how to install\n"
762 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
764 "Please check that \"%s\" is the proper interface.\n"
767 "Help can be found at:\n"
769 " http://wiki.wireshark.org/WinPcap\n"
770 " http://wiki.wireshark.org/CaptureSetup\n",
774 /* If we got a "can't find PPA for X" message, warn the user (who
775 is running dumpcap on HP-UX) that they don't have a version of
776 libpcap that properly handles HP-UX (libpcap 0.6.x and later
777 versions, which properly handle HP-UX, say "can't find /dev/dlpi
778 PPA for X" rather than "can't find PPA for X"). */
779 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
782 "You are running (T)Wireshark with a version of the libpcap library\n"
783 "that doesn't handle HP-UX network devices well; this means that\n"
784 "(T)Wireshark may not be able to capture packets.\n"
786 "To fix this, you should install libpcap 0.6.2, or a later version\n"
787 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
788 "packaged binary form from the Software Porting And Archive Centre\n"
789 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
790 "at the URL lists a number of mirror sites.";
794 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
795 "Please check to make sure you have sufficient permissions, and that you have "
796 "the proper interface or pipe specified.%s", libpcap_warn);
800 /* Set the data link type on a pcap. */
802 set_pcap_linktype(pcap_t *pcap_h, int linktype,
803 #ifdef HAVE_PCAP_SET_DATALINK
808 char *errmsg, size_t errmsg_len,
809 char *secondary_errmsg, size_t secondary_errmsg_len)
811 char *set_linktype_err_str;
814 return TRUE; /* just use the default */
815 #ifdef HAVE_PCAP_SET_DATALINK
816 if (pcap_set_datalink(pcap_h, linktype) == 0)
817 return TRUE; /* no error */
818 set_linktype_err_str = pcap_geterr(pcap_h);
820 /* Let them set it to the type it is; reject any other request. */
821 if (get_pcap_linktype(pcap_h, name) == linktype)
822 return TRUE; /* no error */
823 set_linktype_err_str =
824 "That DLT isn't one of the DLTs supported by this device";
826 g_snprintf(errmsg, (gulong) errmsg_len, "Unable to set data link type (%s).",
827 set_linktype_err_str);
829 * If the error isn't "XXX is not one of the DLTs supported by this device",
830 * tell the user to tell the Wireshark developers about it.
832 if (strstr(set_linktype_err_str, "is not one of the DLTs supported by this device") == NULL)
833 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
835 secondary_errmsg[0] = '\0';
840 compile_capture_filter(const char *iface, pcap_t *pcap_h,
841 struct bpf_program *fcode, const char *cfilter)
843 bpf_u_int32 netnum, netmask;
844 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
846 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
848 * Well, we can't get the netmask for this interface; it's used
849 * only for filters that check for broadcast IP addresses, so
850 * we just punt and use 0. It might be nice to warn the user,
851 * but that's a pain in a GUI application, as it'd involve popping
852 * up a message box, and it's not clear how often this would make
853 * a difference (only filters that check for IP broadcast addresses
857 "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
862 * Sigh. Older versions of libpcap don't properly declare the
863 * third argument to pcap_compile() as a const pointer. Cast
866 if (pcap_compile(pcap_h, fcode, (char *)cfilter, 1, netmask) < 0)
871 #ifdef HAVE_BPF_IMAGE
873 show_filter_code(capture_options *capture_opts)
875 interface_options interface_opts;
877 gchar open_err_str[PCAP_ERRBUF_SIZE];
878 char errmsg[MSG_MAX_LENGTH+1];
879 char secondary_errmsg[MSG_MAX_LENGTH+1];
880 struct bpf_program fcode;
881 struct bpf_insn *insn;
885 for (j = 0; j < capture_opts->ifaces->len; j++) {
886 interface_opts = g_array_index(capture_opts->ifaces, interface_options, j);
887 pcap_h = open_capture_device(&interface_opts, &open_err_str);
888 if (pcap_h == NULL) {
889 /* Open failed; get messages */
890 get_capture_device_open_failure_messages(open_err_str,
892 errmsg, sizeof errmsg,
894 sizeof secondary_errmsg);
895 /* And report them */
896 report_capture_error(errmsg, secondary_errmsg);
900 /* Set the link-layer type. */
901 if (!set_pcap_linktype(pcap_h, interface_opts.linktype, interface_opts.name,
902 errmsg, sizeof errmsg,
903 secondary_errmsg, sizeof secondary_errmsg)) {
905 report_capture_error(errmsg, secondary_errmsg);
909 /* OK, try to compile the capture filter. */
910 if (!compile_capture_filter(interface_opts.name, pcap_h, &fcode,
911 interface_opts.cfilter)) {
913 report_cfilter_error(capture_opts, j, errmsg);
918 /* Now print the filter code. */
919 insn = fcode.bf_insns;
921 for (i = 0; i < fcode.bf_len; insn++, i++)
922 printf("%s\n", bpf_image(insn, i));
924 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
925 /* to remove any suid privileges. */
926 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
927 /* (euid/egid have already previously been set to ruid/rgid. */
928 /* (See comment in main() for details) */
930 relinquish_special_privs_perm();
932 relinquish_all_capabilities();
935 /* Let our parent know we succeeded. */
936 pipe_write_block(2, SP_SUCCESS, NULL);
943 * capture_interface_list() is expected to do the right thing to get
944 * a list of interfaces.
946 * In most of the programs in the Wireshark suite, "the right thing"
947 * is to run dumpcap and ask it for the list, because dumpcap may
948 * be the only program in the suite with enough privileges to get
951 * In dumpcap itself, however, we obviously can't run dumpcap to
952 * ask for the list. Therefore, our capture_interface_list() should
953 * just call get_interface_list().
956 capture_interface_list(int *err, char **err_str)
958 return get_interface_list(err, err_str);
962 * Get the data-link type for a libpcap device.
963 * This works around AIX 5.x's non-standard and incompatible-with-the-
964 * rest-of-the-universe libpcap.
967 get_pcap_linktype(pcap_t *pch, const char *devname
975 const char *ifacename;
978 linktype = pcap_datalink(pch);
982 * The libpcap that comes with AIX 5.x uses RFC 1573 ifType values
983 * rather than DLT_ values for link-layer types; the ifType values
984 * for LAN devices are:
991 * and the ifType value for a loopback device is 24.
993 * The AIX names for LAN devices begin with:
1000 * and the AIX names for loopback devices begin with "lo".
1002 * (The difference between "Ethernet" and "802.3" is presumably
1003 * whether packets have an Ethernet header, with a packet type,
1004 * or an 802.3 header, with a packet length, followed by an 802.2
1005 * header and possibly a SNAP header.)
1007 * If the device name matches "linktype" interpreted as an ifType
1008 * value, rather than as a DLT_ value, we will assume this is AIX's
1009 * non-standard, incompatible libpcap, rather than a standard libpcap,
1010 * and will map the link-layer type to the standard DLT_ value for
1011 * that link-layer type, as that's what the rest of Wireshark expects.
1013 * (This means the capture files won't be readable by a tcpdump
1014 * linked with AIX's non-standard libpcap, but so it goes. They
1015 * *will* be readable by standard versions of tcpdump, Wireshark,
1018 * XXX - if we conclude we're using AIX libpcap, should we also
1019 * set a flag to cause us to assume the time stamps are in
1020 * seconds-and-nanoseconds form, and to convert them to
1021 * seconds-and-microseconds form before processing them and
1026 * Find the last component of the device name, which is the
1029 ifacename = strchr(devname, '/');
1030 if (ifacename == NULL)
1031 ifacename = devname;
1033 /* See if it matches any of the LAN device names. */
1034 if (strncmp(ifacename, "en", 2) == 0) {
1035 if (linktype == 6) {
1037 * That's the RFC 1573 value for Ethernet; map it to DLT_EN10MB.
1041 } else if (strncmp(ifacename, "et", 2) == 0) {
1042 if (linktype == 7) {
1044 * That's the RFC 1573 value for 802.3; map it to DLT_EN10MB.
1045 * (libpcap, tcpdump, Wireshark, etc. don't care if it's Ethernet
1050 } else if (strncmp(ifacename, "tr", 2) == 0) {
1051 if (linktype == 9) {
1053 * That's the RFC 1573 value for 802.5 (Token Ring); map it to
1054 * DLT_IEEE802, which is what's used for Token Ring.
1058 } else if (strncmp(ifacename, "fi", 2) == 0) {
1059 if (linktype == 15) {
1061 * That's the RFC 1573 value for FDDI; map it to DLT_FDDI.
1065 } else if (strncmp(ifacename, "lo", 2) == 0) {
1066 if (linktype == 24) {
1068 * That's the RFC 1573 value for "software loopback" devices; map it
1069 * to DLT_NULL, which is what's used for loopback devices on BSD.
1079 static data_link_info_t *
1080 create_data_link_info(int dlt)
1082 data_link_info_t *data_link_info;
1085 data_link_info = (data_link_info_t *)g_malloc(sizeof (data_link_info_t));
1086 data_link_info->dlt = dlt;
1087 text = pcap_datalink_val_to_name(dlt);
1089 data_link_info->name = g_strdup(text);
1091 data_link_info->name = g_strdup_printf("DLT %d", dlt);
1092 text = pcap_datalink_val_to_description(dlt);
1094 data_link_info->description = g_strdup(text);
1096 data_link_info->description = NULL;
1097 return data_link_info;
1101 * Get the capabilities of a network device.
1103 static if_capabilities_t *
1104 get_if_capabilities(const char *devname, gboolean monitor_mode
1105 #ifndef HAVE_PCAP_CREATE
1110 if_capabilities_t *caps;
1111 char errbuf[PCAP_ERRBUF_SIZE];
1113 #ifdef HAVE_PCAP_CREATE
1117 #ifdef HAVE_PCAP_LIST_DATALINKS
1121 data_link_info_t *data_link_info;
1124 * Allocate the interface capabilities structure.
1126 caps = g_malloc(sizeof *caps);
1129 * WinPcap 4.1.2, and possibly earlier versions, have a bug
1130 * wherein, when an open with an rpcap: URL fails, the error
1131 * message for the error is not copied to errbuf and whatever
1132 * on-the-stack junk is in errbuf is treated as the error
1135 * To work around that (and any other bugs of that sort, we
1136 * initialize errbuf to an empty string. If we get an error
1137 * and the string is empty, we report it as an unknown error.
1138 * (If we *don't* get an error, and the string is *non*-empty,
1139 * that could be a warning returned, such as "can't turn
1140 * promiscuous mode on"; we currently don't do so.)
1143 #ifdef HAVE_PCAP_OPEN
1144 pch = pcap_open(devname, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1145 caps->can_set_rfmon = FALSE;
1147 if (err_str != NULL)
1148 *err_str = g_strdup(errbuf[0] == '\0' ? "Unknown error (pcap bug; actual error cause not reported)" : errbuf);
1152 #elif defined(HAVE_PCAP_CREATE)
1153 pch = pcap_create(devname, errbuf);
1155 if (err_str != NULL)
1156 *err_str = g_strdup(errbuf);
1160 status = pcap_can_set_rfmon(pch);
1163 if (status == PCAP_ERROR)
1164 *err_str = g_strdup_printf("pcap_can_set_rfmon() failed: %s",
1167 *err_str = g_strdup(pcap_statustostr(status));
1173 caps->can_set_rfmon = FALSE;
1174 else if (status == 1) {
1175 caps->can_set_rfmon = TRUE;
1177 pcap_set_rfmon(pch, 1);
1179 if (err_str != NULL) {
1180 *err_str = g_strdup_printf("pcap_can_set_rfmon() returned %d",
1188 status = pcap_activate(pch);
1190 /* Error. We ignore warnings (status > 0). */
1191 if (err_str != NULL) {
1192 if (status == PCAP_ERROR)
1193 *err_str = g_strdup_printf("pcap_activate() failed: %s",
1196 *err_str = g_strdup(pcap_statustostr(status));
1203 pch = pcap_open_live(devname, MIN_PACKET_SIZE, 0, 0, errbuf);
1204 caps->can_set_rfmon = FALSE;
1206 if (err_str != NULL)
1207 *err_str = g_strdup(errbuf[0] == '\0' ? "Unknown error (pcap bug; actual error cause not reported)" : errbuf);
1212 deflt = get_pcap_linktype(pch, devname);
1213 #ifdef HAVE_PCAP_LIST_DATALINKS
1214 nlt = pcap_list_datalinks(pch, &linktypes);
1215 if (nlt == 0 || linktypes == NULL) {
1217 if (err_str != NULL)
1218 *err_str = NULL; /* an empty list doesn't mean an error */
1222 caps->data_link_types = NULL;
1223 for (i = 0; i < nlt; i++) {
1224 data_link_info = create_data_link_info(linktypes[i]);
1227 * XXX - for 802.11, make the most detailed 802.11
1228 * version the default, rather than the one the
1229 * device has as the default?
1231 if (linktypes[i] == deflt)
1232 caps->data_link_types = g_list_prepend(caps->data_link_types,
1235 caps->data_link_types = g_list_append(caps->data_link_types,
1238 #ifdef HAVE_PCAP_FREE_DATALINKS
1239 pcap_free_datalinks(linktypes);
1242 * In Windows, there's no guarantee that if you have a library
1243 * built with one version of the MSVC++ run-time library, and
1244 * it returns a pointer to allocated data, you can free that
1245 * data from a program linked with another version of the
1246 * MSVC++ run-time library.
1248 * This is not an issue on UN*X.
1250 * See the mail threads starting at
1252 * http://www.winpcap.org/pipermail/winpcap-users/2006-September/001421.html
1256 * http://www.winpcap.org/pipermail/winpcap-users/2008-May/002498.html
1259 #define xx_free free /* hack so checkAPIs doesn't complain */
1262 #endif /* HAVE_PCAP_FREE_DATALINKS */
1263 #else /* HAVE_PCAP_LIST_DATALINKS */
1265 data_link_info = create_data_link_info(deflt);
1266 caps->data_link_types = g_list_append(caps->data_link_types,
1268 #endif /* HAVE_PCAP_LIST_DATALINKS */
1272 if (err_str != NULL)
1277 #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
1279 print_machine_readable_interfaces(GList *if_list)
1286 char addr_str[ADDRSTRLEN];
1288 if (capture_child) {
1289 /* Let our parent know we succeeded. */
1290 pipe_write_block(2, SP_SUCCESS, NULL);
1293 i = 1; /* Interface id number */
1294 for (if_entry = g_list_first(if_list); if_entry != NULL;
1295 if_entry = g_list_next(if_entry)) {
1296 if_info = (if_info_t *)if_entry->data;
1297 printf("%d. %s", i++, if_info->name);
1300 * Print the contents of the if_entry struct in a parseable format.
1301 * Each if_entry element is tab-separated. Addresses are comma-
1304 /* XXX - Make sure our description doesn't contain a tab */
1305 if (if_info->description != NULL)
1306 printf("\t%s\t", if_info->description);
1310 for(addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
1311 addr = g_slist_next(addr)) {
1312 if (addr != g_slist_nth(if_info->addrs, 0))
1315 if_addr = (if_addr_t *)addr->data;
1316 switch(if_addr->ifat_type) {
1318 if (inet_ntop(AF_INET, &if_addr->addr.ip4_addr, addr_str,
1320 printf("%s", addr_str);
1322 printf("<unknown IPv4>");
1326 if (inet_ntop(AF_INET6, &if_addr->addr.ip6_addr,
1327 addr_str, ADDRSTRLEN)) {
1328 printf("%s", addr_str);
1330 printf("<unknown IPv6>");
1334 printf("<type unknown %u>", if_addr->ifat_type);
1338 if (if_info->loopback)
1339 printf("\tloopback");
1341 printf("\tnetwork");
1348 * If you change the machine-readable output format of this function,
1349 * you MUST update capture_ifinfo.c:capture_get_if_capabilities() accordingly!
1352 print_machine_readable_if_capabilities(if_capabilities_t *caps)
1355 data_link_info_t *data_link_info;
1356 const gchar *desc_str;
1358 if (capture_child) {
1359 /* Let our parent know we succeeded. */
1360 pipe_write_block(2, SP_SUCCESS, NULL);
1363 if (caps->can_set_rfmon)
1367 for (lt_entry = caps->data_link_types; lt_entry != NULL;
1368 lt_entry = g_list_next(lt_entry)) {
1369 data_link_info = (data_link_info_t *)lt_entry->data;
1370 if (data_link_info->description != NULL)
1371 desc_str = data_link_info->description;
1373 desc_str = "(not supported)";
1374 printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
1384 /* Print the number of packets captured for each interface until we're killed. */
1386 print_statistics_loop(gboolean machine_readable)
1388 GList *if_list, *if_entry, *stat_list = NULL, *stat_entry;
1394 char errbuf[PCAP_ERRBUF_SIZE];
1395 struct pcap_stat ps;
1397 if_list = get_interface_list(&err, &err_str);
1398 if (if_list == NULL) {
1400 case CANT_GET_INTERFACE_LIST:
1401 case DONT_HAVE_PCAP:
1402 cmdarg_err("%s", err_str);
1406 case NO_INTERFACES_FOUND:
1407 cmdarg_err("There are no interfaces on which a capture can be done");
1413 for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) {
1414 if_info = (if_info_t *)if_entry->data;
1415 #ifdef HAVE_PCAP_OPEN
1416 pch = pcap_open(if_info->name, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1418 pch = pcap_open_live(if_info->name, MIN_PACKET_SIZE, 0, 0, errbuf);
1422 if_stat = (if_stat_t *)g_malloc(sizeof(if_stat_t));
1423 if_stat->name = g_strdup(if_info->name);
1425 stat_list = g_list_append(stat_list, if_stat);
1430 cmdarg_err("There are no interfaces on which a capture can be done");
1434 if (capture_child) {
1435 /* Let our parent know we succeeded. */
1436 pipe_write_block(2, SP_SUCCESS, NULL);
1439 if (!machine_readable) {
1440 printf("%-15s %10s %10s\n", "Interface", "Received",
1444 global_ld.go = TRUE;
1445 while (global_ld.go) {
1446 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1447 if_stat = (if_stat_t *)stat_entry->data;
1448 pcap_stats(if_stat->pch, &ps);
1450 if (!machine_readable) {
1451 printf("%-15s %10u %10u\n", if_stat->name,
1452 ps.ps_recv, ps.ps_drop);
1454 printf("%s\t%u\t%u\n", if_stat->name,
1455 ps.ps_recv, ps.ps_drop);
1466 /* XXX - Not reached. Should we look for 'q' in stdin? */
1467 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1468 if_stat = (if_stat_t *)stat_entry->data;
1469 pcap_close(if_stat->pch);
1470 g_free(if_stat->name);
1473 g_list_free(stat_list);
1474 free_interface_list(if_list);
1482 capture_cleanup_handler(DWORD dwCtrlType)
1484 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
1485 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
1486 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
1487 like SIGTERM at least when the machine's shutting down.
1489 For now, if we're running as a command rather than a capture child,
1490 we handle all but CTRL_LOGOFF_EVENT as indications that we should
1491 clean up and quit, just as we handle SIGINT, SIGHUP, and SIGTERM
1492 in that way on UN*X.
1494 If we're not running as a capture child, we might be running as
1495 a service; ignore CTRL_LOGOFF_EVENT, so we keep running after the
1496 user logs out. (XXX - can we explicitly check whether we're
1497 running as a service?) */
1499 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
1500 "Console: Control signal");
1501 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
1502 "Console: Control signal, CtrlType: %u", dwCtrlType);
1504 /* Keep capture running if we're a service and a user logs off */
1505 if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
1506 capture_loop_stop();
1514 capture_cleanup_handler(int signum _U_)
1516 /* On UN*X, we cleanly shut down the capture on SIGINT, SIGHUP, and
1517 SIGTERM. We assume that if the user wanted it to keep running
1518 after they logged out, they'd have nohupped it. */
1520 /* Note: don't call g_log() in the signal handler: if we happened to be in
1521 * g_log() in process context when the signal came in, g_log will detect
1522 * the "recursion" and abort.
1525 capture_loop_stop();
1531 report_capture_count(gboolean reportit)
1533 /* Don't print this if we're a capture child. */
1534 if (!capture_child && reportit) {
1535 fprintf(stderr, "\rPackets captured: %u\n", global_ld.packet_count);
1536 /* stderr could be line buffered */
1544 report_counts_for_siginfo(void)
1546 report_capture_count(quiet);
1547 infoprint = FALSE; /* we just reported it */
1551 report_counts_siginfo(int signum _U_)
1553 int sav_errno = errno;
1555 /* If we've been told to delay printing, just set a flag asking
1556 that we print counts (if we're supposed to), otherwise print
1557 the count of packets captured (if we're supposed to). */
1561 report_counts_for_siginfo();
1564 #endif /* SIGINFO */
1567 exit_main(int status)
1570 /* Shutdown windows sockets */
1573 /* can be helpful for debugging */
1574 #ifdef DEBUG_DUMPCAP
1575 printf("Press any key\n");
1586 * If we were linked with libcap (not related to libpcap), make sure we have
1587 * CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
1588 * (See comment in main() for details)
1591 relinquish_privs_except_capture(void)
1593 /* If 'started_with_special_privs' (ie: suid) then enable for
1594 * ourself the NET_ADMIN and NET_RAW capabilities and then
1595 * drop our suid privileges.
1597 * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
1598 * stuff we don't need (and shouldn't have).
1599 * CAP_NET_RAW: Packet capture (raw sockets).
1602 if (started_with_special_privs()) {
1603 cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
1604 int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
1606 cap_t caps = cap_init(); /* all capabilities initialized to off */
1608 print_caps("Pre drop, pre set");
1610 if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
1611 cmdarg_err("prctl() fail return: %s", g_strerror(errno));
1614 cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
1615 cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
1617 if (cap_set_proc(caps)) {
1618 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1620 print_caps("Pre drop, post set");
1622 relinquish_special_privs_perm();
1624 print_caps("Post drop, pre set");
1625 cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
1626 if (cap_set_proc(caps)) {
1627 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1629 print_caps("Post drop, post set");
1635 #endif /* HAVE_LIBCAP */
1637 /* Take care of byte order in the libpcap headers read from pipes.
1638 * (function taken from wiretap/libpcap.c) */
1640 cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
1643 /* Byte-swap the record header fields. */
1644 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
1645 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
1646 rechdr->incl_len = BSWAP32(rechdr->incl_len);
1647 rechdr->orig_len = BSWAP32(rechdr->orig_len);
1650 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
1651 swapped, in order to match the BPF header layout.
1653 Unfortunately, some files were, according to a comment in the "libpcap"
1654 source, written with version 2.3 in their headers but without the
1655 interchanged fields, so if "incl_len" is greater than "orig_len" - which
1656 would make no sense - we assume that we need to swap them. */
1657 if (hdr->version_major == 2 &&
1658 (hdr->version_minor < 3 ||
1659 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
1662 temp = rechdr->orig_len;
1663 rechdr->orig_len = rechdr->incl_len;
1664 rechdr->incl_len = temp;
1668 /* Wrapper: distinguish between recv/read if we're reading on Windows,
1672 cap_pipe_read(int pipe_fd, char *buf, size_t sz, gboolean from_socket _U_)
1676 return recv(pipe_fd, buf, (int)sz, 0);
1681 return ws_read(pipe_fd, buf, sz);
1687 * Thread function that reads from a pipe and pushes the data
1688 * to the main application thread.
1691 * XXX Right now we use async queues for basic signaling. The main thread
1692 * sets cap_pipe_buf and cap_bytes_to_read, then pushes an item onto
1693 * cap_pipe_pending_q which triggers a read in the cap_pipe_read thread.
1694 * Iff the read is successful cap_pipe_read pushes an item onto
1695 * cap_pipe_done_q, otherwise an error is signaled. No data is passed in
1696 * the queues themselves (yet).
1698 * We might want to move some of the cap_pipe_dispatch logic here so that
1699 * we can let cap_thread_read run independently, queuing up multiple reads
1700 * for the main thread (and possibly get rid of cap_pipe_read_mtx).
1702 static void *cap_thread_read(void *arg)
1704 pcap_options *pcap_opts;
1713 pcap_opts = (pcap_options *)arg;
1714 while (pcap_opts->cap_pipe_err == PIPOK) {
1715 g_async_queue_pop(pcap_opts->cap_pipe_pending_q); /* Wait for our cue (ahem) from the main thread */
1716 g_mutex_lock(pcap_opts->cap_pipe_read_mtx);
1718 while (bytes_read < (int) pcap_opts->cap_pipe_bytes_to_read) {
1719 if ((pcap_opts->from_cap_socket)
1725 b = cap_pipe_read(pcap_opts->cap_pipe_fd, pcap_opts->cap_pipe_buf+bytes_read,
1726 pcap_opts->cap_pipe_bytes_to_read - bytes_read, pcap_opts->from_cap_socket);
1729 pcap_opts->cap_pipe_err = PIPEOF;
1733 pcap_opts->cap_pipe_err = PIPERR;
1744 /* If we try to use read() on a named pipe on Windows with partial
1745 * data it appears to return EOF.
1747 res = ReadFile(pcap_opts->cap_pipe_h, pcap_opts->cap_pipe_buf+bytes_read,
1748 pcap_opts->cap_pipe_bytes_to_read - bytes_read,
1753 last_err = GetLastError();
1754 if (last_err == ERROR_MORE_DATA) {
1756 } else if (last_err == ERROR_HANDLE_EOF || last_err == ERROR_BROKEN_PIPE || last_err == ERROR_PIPE_NOT_CONNECTED) {
1757 pcap_opts->cap_pipe_err = PIPEOF;
1761 pcap_opts->cap_pipe_err = PIPERR;
1764 } else if (b == 0 && pcap_opts->cap_pipe_bytes_to_read > 0) {
1765 pcap_opts->cap_pipe_err = PIPEOF;
1772 pcap_opts->cap_pipe_bytes_read = bytes_read;
1773 if (pcap_opts->cap_pipe_bytes_read >= pcap_opts->cap_pipe_bytes_to_read) {
1774 g_async_queue_push(pcap_opts->cap_pipe_done_q, pcap_opts->cap_pipe_buf); /* Any non-NULL value will do */
1776 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1782 /* Provide select() functionality for a single file descriptor
1783 * on UNIX/POSIX. Windows uses cap_pipe_read via a thread.
1785 * Returns the same values as select.
1788 cap_pipe_select(int pipe_fd)
1791 struct timeval timeout;
1794 FD_SET(pipe_fd, &rfds);
1796 timeout.tv_sec = PIPE_READ_TIMEOUT / 1000000;
1797 timeout.tv_usec = PIPE_READ_TIMEOUT % 1000000;
1799 return select(pipe_fd+1, &rfds, NULL, NULL, &timeout);
1802 #define DEF_TCP_PORT 19000
1805 cap_open_socket(char *pipename, pcap_options *pcap_opts, char *errmsg, int errmsgl)
1807 char *sockname = pipename + 4;
1808 struct sockaddr_in sa;
1815 memset(&sa, 0, sizeof(sa));
1817 p = strchr(sockname, ':');
1819 len = strlen(sockname);
1820 port = DEF_TCP_PORT;
1824 port = strtoul(p + 1, &p, 10);
1825 if (*p || port > 65535) {
1834 strncpy(buf, sockname, len);
1836 if (!inet_pton(AF_INET, buf, &sa.sin_addr)) {
1840 sa.sin_family = AF_INET;
1841 sa.sin_port = htons((u_short)port);
1843 if (((fd = (int)socket(AF_INET, SOCK_STREAM, 0)) < 0) ||
1844 (connect(fd, (struct sockaddr *)&sa, sizeof(sa)) < 0)) {
1846 LPTSTR errorText = NULL;
1849 lastError = WSAGetLastError();
1850 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |
1851 FORMAT_MESSAGE_ALLOCATE_BUFFER |
1852 FORMAT_MESSAGE_IGNORE_INSERTS,
1853 NULL, lastError, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
1854 (LPTSTR)&errorText, 0, NULL);
1856 g_snprintf(errmsg, errmsgl,
1857 "The capture session could not be initiated due to the socket error: \n"
1859 " %d: %S", lastError, errorText ? (char *)errorText : "Unknown");
1861 LocalFree(errorText);
1863 " %d: %s", errno, strerror(errno));
1865 pcap_opts->cap_pipe_err = PIPERR;
1868 cap_pipe_close(fd, TRUE);
1872 pcap_opts->from_cap_socket = TRUE;
1876 g_snprintf(errmsg, errmsgl,
1877 "The capture session could not be initiated because\n"
1878 "\"%s\" is not a valid socket specification", pipename);
1879 pcap_opts->cap_pipe_err = PIPERR;
1883 /* Wrapper: distinguish between closesocket on Windows; use ws_close
1887 cap_pipe_close(int pipe_fd, gboolean from_socket _U_)
1891 closesocket(pipe_fd);
1898 /* Mimic pcap_open_live() for pipe captures
1900 * We check if "pipename" is "-" (stdin), a AF_UNIX socket, or a FIFO,
1901 * open it, and read the header.
1903 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
1904 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
1906 cap_pipe_open_live(char *pipename,
1907 pcap_options *pcap_opts,
1908 struct pcap_hdr *hdr,
1909 char *errmsg, int errmsgl)
1912 ws_statb64 pipe_stat;
1913 struct sockaddr_un sa;
1919 unsigned int bytes_read;
1922 pcap_opts->cap_pipe_fd = -1;
1924 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
1926 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
1929 * XXX - this blocks until a pcap per-file header has been written to
1930 * the pipe, so it could block indefinitely.
1932 if (strcmp(pipename, "-") == 0) {
1934 fd = 0; /* read from stdin */
1936 pcap_opts->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1938 } else if (!strncmp(pipename, "TCP@", 4)) {
1939 if ((fd = cap_open_socket(pipename, pcap_opts, errmsg, errmsgl)) < 0) {
1944 if (ws_stat64(pipename, &pipe_stat) < 0) {
1945 if (errno == ENOENT || errno == ENOTDIR)
1946 pcap_opts->cap_pipe_err = PIPNEXIST;
1948 g_snprintf(errmsg, errmsgl,
1949 "The capture session could not be initiated "
1950 "due to error getting information on pipe/socket: %s", g_strerror(errno));
1951 pcap_opts->cap_pipe_err = PIPERR;
1955 if (S_ISFIFO(pipe_stat.st_mode)) {
1956 fd = ws_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
1958 g_snprintf(errmsg, errmsgl,
1959 "The capture session could not be initiated "
1960 "due to error on pipe open: %s", g_strerror(errno));
1961 pcap_opts->cap_pipe_err = PIPERR;
1964 } else if (S_ISSOCK(pipe_stat.st_mode)) {
1965 fd = socket(AF_UNIX, SOCK_STREAM, 0);
1967 g_snprintf(errmsg, errmsgl,
1968 "The capture session could not be initiated "
1969 "due to error on socket create: %s", g_strerror(errno));
1970 pcap_opts->cap_pipe_err = PIPERR;
1973 sa.sun_family = AF_UNIX;
1975 * The Single UNIX Specification says:
1977 * The size of sun_path has intentionally been left undefined.
1978 * This is because different implementations use different sizes.
1979 * For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a size
1980 * of 104. Since most implementations originate from BSD versions,
1981 * the size is typically in the range 92 to 108.
1983 * Applications should not assume a particular length for sun_path
1984 * or assume that it can hold {_POSIX_PATH_MAX} bytes (256).
1988 * The <sys/un.h> header shall define the sockaddr_un structure,
1989 * which shall include at least the following members:
1991 * sa_family_t sun_family Address family.
1992 * char sun_path[] Socket pathname.
1994 * so we assume that it's an array, with a specified size,
1995 * and that the size reflects the maximum path length.
1997 if (g_strlcpy(sa.sun_path, pipename, sizeof sa.sun_path) > sizeof sa.sun_path) {
1998 /* Path name too long */
1999 g_snprintf(errmsg, errmsgl,
2000 "The capture session coud not be initiated "
2001 "due to error on socket connect: Path name too long");
2002 pcap_opts->cap_pipe_err = PIPERR;
2006 b = connect(fd, (struct sockaddr *)&sa, sizeof sa);
2008 g_snprintf(errmsg, errmsgl,
2009 "The capture session coud not be initiated "
2010 "due to error on socket connect: %s", g_strerror(errno));
2011 pcap_opts->cap_pipe_err = PIPERR;
2016 if (S_ISCHR(pipe_stat.st_mode)) {
2018 * Assume the user specified an interface on a system where
2019 * interfaces are in /dev. Pretend we haven't seen it.
2021 pcap_opts->cap_pipe_err = PIPNEXIST;
2024 g_snprintf(errmsg, errmsgl,
2025 "The capture session could not be initiated because\n"
2026 "\"%s\" is neither an interface nor a socket nor a pipe", pipename);
2027 pcap_opts->cap_pipe_err = PIPERR;
2032 #define PIPE_STR "\\pipe\\"
2033 /* Under Windows, named pipes _must_ have the form
2034 * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
2036 pncopy = g_strdup(pipename);
2037 if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
2038 pos = strchr(pncopy + 3, '\\');
2039 if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
2046 g_snprintf(errmsg, errmsgl,
2047 "The capture session could not be initiated because\n"
2048 "\"%s\" is neither an interface nor a pipe", pipename);
2049 pcap_opts->cap_pipe_err = PIPNEXIST;
2053 /* Wait for the pipe to appear */
2055 pcap_opts->cap_pipe_h = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
2056 OPEN_EXISTING, 0, NULL);
2058 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE)
2061 if (GetLastError() != ERROR_PIPE_BUSY) {
2062 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
2063 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2064 g_snprintf(errmsg, errmsgl,
2065 "The capture session on \"%s\" could not be started "
2066 "due to error on pipe open: %s (error %d)",
2067 pipename, utf_16to8(err_str), GetLastError());
2069 pcap_opts->cap_pipe_err = PIPERR;
2073 if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
2074 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
2075 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2076 g_snprintf(errmsg, errmsgl,
2077 "The capture session on \"%s\" timed out during "
2078 "pipe open: %s (error %d)",
2079 pipename, utf_16to8(err_str), GetLastError());
2081 pcap_opts->cap_pipe_err = PIPERR;
2088 pcap_opts->from_cap_pipe = TRUE;
2090 if ((pcap_opts->from_cap_socket)
2096 /* read the pcap header */
2098 while (bytes_read < sizeof magic) {
2099 sel_ret = cap_pipe_select(fd);
2101 g_snprintf(errmsg, errmsgl,
2102 "Unexpected error from select: %s", g_strerror(errno));
2104 } else if (sel_ret > 0) {
2105 b = cap_pipe_read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read, pcap_opts->from_cap_socket);
2108 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
2110 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
2120 g_thread_create(&cap_thread_read, pcap_opts, FALSE, NULL);
2122 pcap_opts->cap_pipe_buf = (char *) &magic;
2123 pcap_opts->cap_pipe_bytes_read = 0;
2124 pcap_opts->cap_pipe_bytes_to_read = sizeof(magic);
2125 /* We don't have to worry about cap_pipe_read_mtx here */
2126 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2127 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
2128 if (pcap_opts->cap_pipe_bytes_read <= 0) {
2129 if (pcap_opts->cap_pipe_bytes_read == 0)
2130 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
2132 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
2141 case PCAP_NSEC_MAGIC:
2142 /* Host that wrote it has our byte order, and was running
2143 a program using either standard or ss990417 libpcap. */
2144 pcap_opts->cap_pipe_byte_swapped = FALSE;
2145 pcap_opts->cap_pipe_modified = FALSE;
2146 pcap_opts->ts_nsec = magic == PCAP_NSEC_MAGIC;
2148 case PCAP_MODIFIED_MAGIC:
2149 /* Host that wrote it has our byte order, but was running
2150 a program using either ss990915 or ss991029 libpcap. */
2151 pcap_opts->cap_pipe_byte_swapped = FALSE;
2152 pcap_opts->cap_pipe_modified = TRUE;
2154 case PCAP_SWAPPED_MAGIC:
2155 case PCAP_SWAPPED_NSEC_MAGIC:
2156 /* Host that wrote it has a byte order opposite to ours,
2157 and was running a program using either standard or
2158 ss990417 libpcap. */
2159 pcap_opts->cap_pipe_byte_swapped = TRUE;
2160 pcap_opts->cap_pipe_modified = FALSE;
2161 pcap_opts->ts_nsec = magic == PCAP_SWAPPED_NSEC_MAGIC;
2163 case PCAP_SWAPPED_MODIFIED_MAGIC:
2164 /* Host that wrote it out has a byte order opposite to
2165 ours, and was running a program using either ss990915
2166 or ss991029 libpcap. */
2167 pcap_opts->cap_pipe_byte_swapped = TRUE;
2168 pcap_opts->cap_pipe_modified = TRUE;
2171 /* Not a "libpcap" type we know about. */
2172 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
2176 if ((pcap_opts->from_cap_socket)
2182 /* Read the rest of the header */
2184 while (bytes_read < sizeof(struct pcap_hdr)) {
2185 sel_ret = cap_pipe_select(fd);
2187 g_snprintf(errmsg, errmsgl,
2188 "Unexpected error from select: %s", g_strerror(errno));
2190 } else if (sel_ret > 0) {
2191 b = cap_pipe_read(fd, ((char *)hdr)+bytes_read,
2192 sizeof(struct pcap_hdr) - bytes_read, pcap_opts->from_cap_socket);
2195 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
2197 g_snprintf(errmsg, errmsgl, "Error on pipe header during open: %s",
2207 pcap_opts->cap_pipe_buf = (char *) hdr;
2208 pcap_opts->cap_pipe_bytes_read = 0;
2209 pcap_opts->cap_pipe_bytes_to_read = sizeof(struct pcap_hdr);
2210 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2211 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
2212 if (pcap_opts->cap_pipe_bytes_read <= 0) {
2213 if (pcap_opts->cap_pipe_bytes_read == 0)
2214 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
2216 g_snprintf(errmsg, errmsgl, "Error on pipe header header during open: %s",
2223 if (pcap_opts->cap_pipe_byte_swapped) {
2224 /* Byte-swap the header fields about which we care. */
2225 hdr->version_major = BSWAP16(hdr->version_major);
2226 hdr->version_minor = BSWAP16(hdr->version_minor);
2227 hdr->snaplen = BSWAP32(hdr->snaplen);
2228 hdr->network = BSWAP32(hdr->network);
2230 pcap_opts->linktype = hdr->network;
2232 if (hdr->version_major < 2) {
2233 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
2237 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2238 pcap_opts->cap_pipe_err = PIPOK;
2239 pcap_opts->cap_pipe_fd = fd;
2243 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
2244 pcap_opts->cap_pipe_err = PIPERR;
2245 cap_pipe_close(fd, pcap_opts->from_cap_socket);
2246 pcap_opts->cap_pipe_fd = -1;
2252 /* We read one record from the pipe, take care of byte order in the record
2253 * header, write the record to the capture file, and update capture statistics. */
2255 cap_pipe_dispatch(loop_data *ld, pcap_options *pcap_opts, guchar *data, char *errmsg, int errmsgl)
2257 struct pcap_pkthdr phdr;
2258 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
2261 #if !GLIB_CHECK_VERSION(2,31,18)
2269 #ifdef LOG_CAPTURE_VERBOSE
2270 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
2273 switch (pcap_opts->cap_pipe_state) {
2275 case STATE_EXPECT_REC_HDR:
2277 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2280 pcap_opts->cap_pipe_state = STATE_READ_REC_HDR;
2281 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_modified ?
2282 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
2283 pcap_opts->cap_pipe_bytes_read = 0;
2286 pcap_opts->cap_pipe_buf = (char *) &pcap_opts->cap_pipe_rechdr;
2287 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2288 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2293 case STATE_READ_REC_HDR:
2294 if ((pcap_opts->from_cap_socket)
2300 b = cap_pipe_read(pcap_opts->cap_pipe_fd, ((char *)&pcap_opts->cap_pipe_rechdr)+pcap_opts->cap_pipe_bytes_read,
2301 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read, pcap_opts->from_cap_socket);
2304 result = PD_PIPE_EOF;
2306 result = PD_PIPE_ERR;
2309 pcap_opts->cap_pipe_bytes_read += b;
2314 #if GLIB_CHECK_VERSION(2,31,18)
2315 q_status = g_async_queue_timeout_pop(pcap_opts->cap_pipe_done_q, PIPE_READ_TIMEOUT);
2317 g_get_current_time(&wait_time);
2318 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2319 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2321 if (pcap_opts->cap_pipe_err == PIPEOF) {
2322 result = PD_PIPE_EOF;
2324 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2325 result = PD_PIPE_ERR;
2333 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2335 result = PD_REC_HDR_READ;
2338 case STATE_EXPECT_DATA:
2340 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2343 pcap_opts->cap_pipe_state = STATE_READ_DATA;
2344 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2345 pcap_opts->cap_pipe_bytes_read = 0;
2348 pcap_opts->cap_pipe_buf = (char *) data;
2349 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2350 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2355 case STATE_READ_DATA:
2356 if ((pcap_opts->from_cap_socket)
2362 b = cap_pipe_read(pcap_opts->cap_pipe_fd, data+pcap_opts->cap_pipe_bytes_read,
2363 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read, pcap_opts->from_cap_socket);
2366 result = PD_PIPE_EOF;
2368 result = PD_PIPE_ERR;
2371 pcap_opts->cap_pipe_bytes_read += b;
2377 #if GLIB_CHECK_VERSION(2,31,18)
2378 q_status = g_async_queue_timeout_pop(pcap_opts->cap_pipe_done_q, PIPE_READ_TIMEOUT);
2380 g_get_current_time(&wait_time);
2381 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2382 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2384 if (pcap_opts->cap_pipe_err == PIPEOF) {
2385 result = PD_PIPE_EOF;
2387 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2388 result = PD_PIPE_ERR;
2396 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2398 result = PD_DATA_READ;
2402 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
2405 } /* switch (pcap_opts->cap_pipe_state) */
2408 * We've now read as much data as we were expecting, so process it.
2412 case PD_REC_HDR_READ:
2413 /* We've read the header. Take care of byte order. */
2414 cap_pipe_adjust_header(pcap_opts->cap_pipe_byte_swapped, &pcap_opts->cap_pipe_hdr,
2415 &pcap_opts->cap_pipe_rechdr.hdr);
2416 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
2417 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
2418 ld->packet_count+1, pcap_opts->cap_pipe_rechdr.hdr.incl_len);
2422 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len) {
2423 pcap_opts->cap_pipe_state = STATE_EXPECT_DATA;
2426 /* no data to read? fall through */
2429 /* Fill in a "struct pcap_pkthdr", and process the packet. */
2430 phdr.ts.tv_sec = pcap_opts->cap_pipe_rechdr.hdr.ts_sec;
2431 phdr.ts.tv_usec = pcap_opts->cap_pipe_rechdr.hdr.ts_usec;
2432 phdr.caplen = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2433 phdr.len = pcap_opts->cap_pipe_rechdr.hdr.orig_len;
2436 capture_loop_queue_packet_cb((u_char *)pcap_opts, &phdr, data);
2438 capture_loop_write_packet_cb((u_char *)pcap_opts, &phdr, data);
2440 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2444 pcap_opts->cap_pipe_err = PIPEOF;
2449 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
2450 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2451 g_snprintf(errmsg, errmsgl,
2452 "Error reading from pipe: %s (error %d)",
2453 utf_16to8(err_str), GetLastError());
2456 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
2464 pcap_opts->cap_pipe_err = PIPERR;
2465 /* Return here rather than inside the switch to prevent GCC warning */
2470 /** Open the capture input file (pcap or capture pipe).
2471 * Returns TRUE if it succeeds, FALSE otherwise. */
2473 capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
2474 char *errmsg, size_t errmsg_len,
2475 char *secondary_errmsg, size_t secondary_errmsg_len)
2477 gchar open_err_str[PCAP_ERRBUF_SIZE];
2478 gchar *sync_msg_str;
2479 interface_options interface_opts;
2480 pcap_options *pcap_opts;
2484 gchar *sync_secondary_msg_str;
2485 WORD wVersionRequested;
2489 /* XXX - opening Winsock on tshark? */
2491 /* Initialize Windows Socket if we are in a WIN32 OS
2492 This needs to be done before querying the interface for network/netmask */
2494 /* XXX - do we really require 1.1 or earlier?
2495 Are there any versions that support only 2.0 or higher? */
2496 wVersionRequested = MAKEWORD(1, 1);
2497 err = WSAStartup(wVersionRequested, &wsaData);
2501 case WSASYSNOTREADY:
2502 g_snprintf(errmsg, (gulong) errmsg_len,
2503 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
2506 case WSAVERNOTSUPPORTED:
2507 g_snprintf(errmsg, (gulong) errmsg_len,
2508 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
2509 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
2512 case WSAEINPROGRESS:
2513 g_snprintf(errmsg, (gulong) errmsg_len,
2514 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
2518 g_snprintf(errmsg, (gulong) errmsg_len,
2519 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
2523 g_snprintf(errmsg, (gulong) errmsg_len,
2524 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
2528 g_snprintf(errmsg, (gulong) errmsg_len,
2529 "Couldn't initialize Windows Sockets: error %d", err);
2532 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
2536 if ((use_threads == FALSE) &&
2537 (capture_opts->ifaces->len > 1)) {
2538 g_snprintf(errmsg, (gulong) errmsg_len,
2539 "Using threads is required for capturing on multiple interfaces!");
2543 for (i = 0; i < capture_opts->ifaces->len; i++) {
2544 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2545 pcap_opts = (pcap_options *)g_malloc(sizeof (pcap_options));
2546 if (pcap_opts == NULL) {
2547 g_snprintf(errmsg, (gulong) errmsg_len,
2548 "Could not allocate memory.");
2551 pcap_opts->received = 0;
2552 pcap_opts->dropped = 0;
2553 pcap_opts->pcap_h = NULL;
2554 #ifdef MUST_DO_SELECT
2555 pcap_opts->pcap_fd = -1;
2557 pcap_opts->pcap_err = FALSE;
2558 pcap_opts->interface_id = i;
2559 pcap_opts->tid = NULL;
2560 pcap_opts->snaplen = 0;
2561 pcap_opts->linktype = -1;
2562 pcap_opts->ts_nsec = FALSE;
2563 pcap_opts->from_cap_pipe = FALSE;
2564 pcap_opts->from_cap_socket = FALSE;
2565 memset(&pcap_opts->cap_pipe_hdr, 0, sizeof(struct pcap_hdr));
2566 memset(&pcap_opts->cap_pipe_rechdr, 0, sizeof(struct pcaprec_modified_hdr));
2568 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2570 pcap_opts->cap_pipe_fd = -1;
2571 pcap_opts->cap_pipe_modified = FALSE;
2572 pcap_opts->cap_pipe_byte_swapped = FALSE;
2574 pcap_opts->cap_pipe_buf = NULL;
2576 pcap_opts->cap_pipe_bytes_to_read = 0;
2577 pcap_opts->cap_pipe_bytes_read = 0;
2578 pcap_opts->cap_pipe_state = 0;
2579 pcap_opts->cap_pipe_err = PIPOK;
2581 #if GLIB_CHECK_VERSION(2,31,0)
2582 pcap_opts->cap_pipe_read_mtx = g_malloc(sizeof(GMutex));
2583 g_mutex_init(pcap_opts->cap_pipe_read_mtx);
2585 pcap_opts->cap_pipe_read_mtx = g_mutex_new();
2587 pcap_opts->cap_pipe_pending_q = g_async_queue_new();
2588 pcap_opts->cap_pipe_done_q = g_async_queue_new();
2590 g_array_append_val(ld->pcaps, pcap_opts);
2592 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", interface_opts.name);
2593 pcap_opts->pcap_h = open_capture_device(&interface_opts, &open_err_str);
2595 if (pcap_opts->pcap_h != NULL) {
2596 /* we've opened "iface" as a network device */
2598 /* try to set the capture buffer size */
2599 if (interface_opts.buffer_size > 1 &&
2600 pcap_setbuff(pcap_opts->pcap_h, interface_opts.buffer_size * 1024 * 1024) != 0) {
2601 sync_secondary_msg_str = g_strdup_printf(
2602 "The capture buffer size of %dMB seems to be too high for your machine,\n"
2603 "the default of 1MB will be used.\n"
2605 "Nonetheless, the capture is started.\n",
2606 interface_opts.buffer_size);
2607 report_capture_error("Couldn't set the capture buffer size!",
2608 sync_secondary_msg_str);
2609 g_free(sync_secondary_msg_str);
2613 #if defined(HAVE_PCAP_SETSAMPLING)
2614 if (interface_opts.sampling_method != CAPTURE_SAMP_NONE) {
2615 struct pcap_samp *samp;
2617 if ((samp = pcap_setsampling(pcap_opts->pcap_h)) != NULL) {
2618 switch (interface_opts.sampling_method) {
2619 case CAPTURE_SAMP_BY_COUNT:
2620 samp->method = PCAP_SAMP_1_EVERY_N;
2623 case CAPTURE_SAMP_BY_TIMER:
2624 samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
2628 sync_msg_str = g_strdup_printf(
2629 "Unknown sampling method %d specified,\n"
2630 "continue without packet sampling",
2631 interface_opts.sampling_method);
2632 report_capture_error("Couldn't set the capture "
2633 "sampling", sync_msg_str);
2634 g_free(sync_msg_str);
2636 samp->value = interface_opts.sampling_param;
2638 report_capture_error("Couldn't set the capture sampling",
2639 "Cannot get packet sampling data structure");
2644 /* setting the data link type only works on real interfaces */
2645 if (!set_pcap_linktype(pcap_opts->pcap_h, interface_opts.linktype, interface_opts.name,
2647 secondary_errmsg, secondary_errmsg_len)) {
2650 pcap_opts->linktype = get_pcap_linktype(pcap_opts->pcap_h, interface_opts.name);
2652 /* We couldn't open "iface" as a network device. */
2653 /* Try to open it as a pipe */
2654 cap_pipe_open_live(interface_opts.name, pcap_opts, &pcap_opts->cap_pipe_hdr, errmsg, (int) errmsg_len);
2657 if (pcap_opts->cap_pipe_fd == -1) {
2659 if (pcap_opts->cap_pipe_h == INVALID_HANDLE_VALUE) {
2661 if (pcap_opts->cap_pipe_err == PIPNEXIST) {
2662 /* Pipe doesn't exist, so output message for interface */
2663 get_capture_device_open_failure_messages(open_err_str,
2664 interface_opts.name,
2668 secondary_errmsg_len);
2671 * Else pipe (or file) does exist and cap_pipe_open_live() has
2676 /* cap_pipe_open_live() succeeded; don't want
2677 error message from pcap_open_live() */
2678 open_err_str[0] = '\0';
2682 /* XXX - will this work for tshark? */
2683 #ifdef MUST_DO_SELECT
2684 if (!pcap_opts->from_cap_pipe) {
2685 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
2686 pcap_opts->pcap_fd = pcap_get_selectable_fd(pcap_opts->pcap_h);
2688 pcap_opts->pcap_fd = pcap_fileno(pcap_opts->pcap_h);
2693 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
2694 returned a warning; print it, but keep capturing. */
2695 if (open_err_str[0] != '\0') {
2696 sync_msg_str = g_strdup_printf("%s.", open_err_str);
2697 report_capture_error(sync_msg_str, "");
2698 g_free(sync_msg_str);
2700 capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
2701 g_array_insert_val(capture_opts->ifaces, i, interface_opts);
2704 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
2705 /* to remove any suid privileges. */
2706 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
2707 /* (euid/egid have already previously been set to ruid/rgid. */
2708 /* (See comment in main() for details) */
2710 relinquish_special_privs_perm();
2712 relinquish_all_capabilities();
2717 /* close the capture input file (pcap or capture pipe) */
2718 static void capture_loop_close_input(loop_data *ld)
2721 pcap_options *pcap_opts;
2723 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
2725 for (i = 0; i < ld->pcaps->len; i++) {
2726 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2727 /* if open, close the capture pipe "input file" */
2728 if (pcap_opts->cap_pipe_fd >= 0) {
2729 g_assert(pcap_opts->from_cap_pipe);
2730 cap_pipe_close(pcap_opts->cap_pipe_fd, pcap_opts->from_cap_socket);
2731 pcap_opts->cap_pipe_fd = -1;
2734 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE) {
2735 CloseHandle(pcap_opts->cap_pipe_h);
2736 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2739 /* if open, close the pcap "input file" */
2740 if (pcap_opts->pcap_h != NULL) {
2741 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", (void *)pcap_opts->pcap_h);
2742 pcap_close(pcap_opts->pcap_h);
2743 pcap_opts->pcap_h = NULL;
2750 /* Shut down windows sockets */
2756 /* init the capture filter */
2757 static initfilter_status_t
2758 capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe,
2759 const gchar * name, const gchar * cfilter)
2761 struct bpf_program fcode;
2763 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
2765 /* capture filters only work on real interfaces */
2766 if (cfilter && !from_cap_pipe) {
2767 /* A capture filter was specified; set it up. */
2768 if (!compile_capture_filter(name, pcap_h, &fcode, cfilter)) {
2769 /* Treat this specially - our caller might try to compile this
2770 as a display filter and, if that succeeds, warn the user that
2771 the display and capture filter syntaxes are different. */
2772 return INITFILTER_BAD_FILTER;
2774 if (pcap_setfilter(pcap_h, &fcode) < 0) {
2775 #ifdef HAVE_PCAP_FREECODE
2776 pcap_freecode(&fcode);
2778 return INITFILTER_OTHER_ERROR;
2780 #ifdef HAVE_PCAP_FREECODE
2781 pcap_freecode(&fcode);
2785 return INITFILTER_NO_ERROR;
2789 /* set up to write to the already-opened capture output file/files */
2791 capture_loop_init_output(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len)
2795 pcap_options *pcap_opts;
2796 interface_options interface_opts;
2797 gboolean successful;
2799 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
2801 if ((capture_opts->use_pcapng == FALSE) &&
2802 (capture_opts->ifaces->len > 1)) {
2803 g_snprintf(errmsg, errmsg_len,
2804 "Using PCAPNG is required for capturing on multiple interfaces! Use the -n option.");
2808 /* Set up to write to the capture file. */
2809 if (capture_opts->multi_files_on) {
2810 ld->pdh = ringbuf_init_libpcap_fdopen(&err);
2812 ld->pdh = libpcap_fdopen(ld->save_file_fd, &err);
2815 if (capture_opts->use_pcapng) {
2817 GString *os_info_str;
2819 os_info_str = g_string_new("");
2820 get_os_version_info(os_info_str);
2822 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2823 successful = libpcap_write_session_header_block(ld->pdh,
2826 os_info_str->str, /* OS*/
2828 -1, /* section_length */
2832 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2833 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2834 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2835 if (pcap_opts->from_cap_pipe) {
2836 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2838 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2840 successful = libpcap_write_interface_description_block(global_ld.pdh,
2841 NULL, /* OPT_COMMENT 1 */
2842 interface_opts.name, /* IDB_NAME 2 */
2843 interface_opts.descr, /* IDB_DESCRIPTION 3 */
2844 interface_opts.cfilter, /* IDB_FILTER 11 */
2845 os_info_str->str, /* IDB_OS 12 */
2846 pcap_opts->linktype,
2848 &(global_ld.bytes_written),
2849 0, /* IDB_IF_SPEED 8 */
2850 pcap_opts->ts_nsec ? 9 : 6, /* IDB_TSRESOL 9 */
2854 g_string_free(os_info_str, TRUE);
2857 pcap_opts = g_array_index(ld->pcaps, pcap_options *, 0);
2858 if (pcap_opts->from_cap_pipe) {
2859 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2861 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2863 successful = libpcap_write_file_header(ld->pdh, pcap_opts->linktype, pcap_opts->snaplen,
2864 pcap_opts->ts_nsec, &ld->bytes_written, &err);
2872 if (ld->pdh == NULL) {
2873 /* We couldn't set up to write to the capture file. */
2874 /* XXX - use cf_open_error_message from tshark instead? */
2879 g_snprintf(errmsg, errmsg_len,
2880 "The file to which the capture would be"
2881 " saved (\"%s\") could not be opened: Error %d.",
2882 capture_opts->save_file, err);
2884 g_snprintf(errmsg, errmsg_len,
2885 "The file to which the capture would be"
2886 " saved (\"%s\") could not be opened: %s.",
2887 capture_opts->save_file, g_strerror(err));
2899 capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close)
2903 pcap_options *pcap_opts;
2904 guint64 end_time = create_timestamp();
2906 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
2908 if (capture_opts->multi_files_on) {
2909 return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
2911 if (capture_opts->use_pcapng) {
2912 for (i = 0; i < global_ld.pcaps->len; i++) {
2913 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
2914 if (!pcap_opts->from_cap_pipe) {
2915 guint64 isb_ifrecv, isb_ifdrop;
2916 struct pcap_stat stats;
2918 if (pcap_stats(pcap_opts->pcap_h, &stats) >= 0) {
2919 isb_ifrecv = pcap_opts->received;
2920 isb_ifdrop = stats.ps_drop + pcap_opts->dropped;
2922 isb_ifrecv = G_MAXUINT64;
2923 isb_ifdrop = G_MAXUINT64;
2925 libpcap_write_interface_statistics_block(ld->pdh,
2928 "Counters provided by dumpcap",
2937 return libpcap_dump_close(ld->pdh, err_close);
2941 /* dispatch incoming packets (pcap or capture pipe)
2943 * Waits for incoming packets to be available, and calls pcap_dispatch()
2944 * to cause them to be processed.
2946 * Returns the number of packets which were processed.
2948 * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
2949 * packet-batching behaviour does not cause packets to get held back
2953 capture_loop_dispatch(loop_data *ld,
2954 char *errmsg, int errmsg_len, pcap_options *pcap_opts)
2957 gint packet_count_before;
2958 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
2963 packet_count_before = ld->packet_count;
2964 if (pcap_opts->from_cap_pipe) {
2965 /* dispatch from capture pipe */
2966 #ifdef LOG_CAPTURE_VERBOSE
2967 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
2970 sel_ret = cap_pipe_select(pcap_opts->cap_pipe_fd);
2972 if (sel_ret < 0 && errno != EINTR) {
2973 g_snprintf(errmsg, errmsg_len,
2974 "Unexpected error from select: %s", g_strerror(errno));
2975 report_capture_error(errmsg, please_report);
2980 * "select()" says we can read from the pipe without blocking
2983 inpkts = cap_pipe_dispatch(ld, pcap_opts, pcap_data, errmsg, errmsg_len);
2993 /* dispatch from pcap */
2994 #ifdef MUST_DO_SELECT
2996 * If we have "pcap_get_selectable_fd()", we use it to get the
2997 * descriptor on which to select; if that's -1, it means there
2998 * is no descriptor on which you can do a "select()" (perhaps
2999 * because you're capturing on a special device, and that device's
3000 * driver unfortunately doesn't support "select()", in which case
3001 * we don't do the select - which means it might not be possible
3002 * to stop a capture until a packet arrives. If that's unacceptable,
3003 * plead with whoever supplies the software for that device to add
3004 * "select()" support, or upgrade to libpcap 0.8.1 or later, and
3005 * rebuild Wireshark or get a version built with libpcap 0.8.1 or
3006 * later, so it can use pcap_breakloop().
3008 #ifdef LOG_CAPTURE_VERBOSE
3009 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
3011 if (pcap_opts->pcap_fd != -1) {
3012 sel_ret = cap_pipe_select(pcap_opts->pcap_fd);
3015 * "select()" says we can read from it without blocking; go for
3018 * We don't have pcap_breakloop(), so we only process one packet
3019 * per pcap_dispatch() call, to allow a signal to stop the
3020 * processing immediately, rather than processing all packets
3021 * in a batch before quitting.
3024 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
3026 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
3030 /* Error, rather than pcap_breakloop(). */
3031 pcap_opts->pcap_err = TRUE;
3033 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
3036 if (sel_ret < 0 && errno != EINTR) {
3037 g_snprintf(errmsg, errmsg_len,
3038 "Unexpected error from select: %s", g_strerror(errno));
3039 report_capture_error(errmsg, please_report);
3045 #endif /* MUST_DO_SELECT */
3047 /* dispatch from pcap without select */
3049 #ifdef LOG_CAPTURE_VERBOSE
3050 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
3054 * On Windows, we don't support asynchronously telling a process to
3055 * stop capturing; instead, we check for an indication on a pipe
3056 * after processing packets. We therefore process only one packet
3057 * at a time, so that we can check the pipe after every packet.
3060 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
3062 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
3066 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
3068 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
3073 /* Error, rather than pcap_breakloop(). */
3074 pcap_opts->pcap_err = TRUE;
3076 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
3078 #else /* pcap_next_ex */
3079 #ifdef LOG_CAPTURE_VERBOSE
3080 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
3082 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
3085 * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
3086 * see http://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
3087 * This should be fixed in the WinPcap 4.0 alpha release.
3089 * For reference, an example remote interface:
3090 * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
3093 /* emulate dispatch from pcap */
3096 struct pcap_pkthdr *pkt_header;
3101 (in = pcap_next_ex(pcap_opts->pcap_h, &pkt_header, &pkt_data)) == 1) {
3103 capture_loop_queue_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
3105 capture_loop_write_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
3110 pcap_opts->pcap_err = TRUE;
3114 #endif /* pcap_next_ex */
3118 #ifdef LOG_CAPTURE_VERBOSE
3119 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
3122 return ld->packet_count - packet_count_before;
3126 /* Isolate the Universally Unique Identifier from the interface. Basically, we
3127 * want to grab only the characters between the '{' and '}' delimiters.
3129 * Returns a GString that must be freed with g_string_free(). */
3131 isolate_uuid(const char *iface)
3136 ptr = strchr(iface, '{');
3138 return g_string_new(iface);
3139 gstr = g_string_new(ptr + 1);
3141 ptr = strchr(gstr->str, '}');
3145 gstr = g_string_truncate(gstr, ptr - gstr->str);
3150 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
3151 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
3153 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
3154 char *errmsg, int errmsg_len)
3157 gchar *capfile_name;
3159 gboolean is_tempfile;
3161 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
3162 (capture_opts->save_file) ? capture_opts->save_file : "(not specified)");
3164 if (capture_opts->save_file != NULL) {
3165 /* We return to the caller while the capture is in progress.
3166 * Therefore we need to take a copy of save_file in
3167 * case the caller destroys it after we return.
3169 capfile_name = g_strdup(capture_opts->save_file);
3171 if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
3172 if (capture_opts->multi_files_on) {
3173 /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
3174 g_snprintf(errmsg, errmsg_len,
3175 "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
3176 g_free(capfile_name);
3179 if (strcmp(capfile_name, "-") == 0) {
3180 /* write to stdout */
3183 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
3184 _setmode(1, O_BINARY);
3187 } /* if (...output_to_pipe ... */
3190 if (capture_opts->multi_files_on) {
3191 /* ringbuffer is enabled */
3192 *save_file_fd = ringbuf_init(capfile_name,
3193 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0,
3194 capture_opts->group_read_access);
3196 /* we need the ringbuf name */
3197 if(*save_file_fd != -1) {
3198 g_free(capfile_name);
3199 capfile_name = g_strdup(ringbuf_current_filename());
3202 /* Try to open/create the specified file for use as a capture buffer. */
3203 *save_file_fd = ws_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
3204 (capture_opts->group_read_access) ? 0640 : 0600);
3207 is_tempfile = FALSE;
3209 /* Choose a random name for the temporary capture buffer */
3210 if (global_capture_opts.ifaces->len > 1) {
3211 prefix = g_strdup_printf("wireshark_%d_interfaces", global_capture_opts.ifaces->len);
3216 iface = isolate_uuid(g_array_index(global_capture_opts.ifaces, interface_options, 0).name);
3217 basename = g_path_get_basename(iface->str);
3218 g_string_free(iface, TRUE);
3220 basename = g_path_get_basename(g_array_index(global_capture_opts.ifaces, interface_options, 0).name);
3222 prefix = g_strconcat("wireshark_", basename, NULL);
3225 *save_file_fd = create_tempfile(&tmpname, prefix);
3227 capfile_name = g_strdup(tmpname);
3231 /* did we fail to open the output file? */
3232 if (*save_file_fd == -1) {
3234 g_snprintf(errmsg, errmsg_len,
3235 "The temporary file to which the capture would be saved (\"%s\") "
3236 "could not be opened: %s.", capfile_name, g_strerror(errno));
3238 if (capture_opts->multi_files_on) {
3239 ringbuf_error_cleanup();
3242 g_snprintf(errmsg, errmsg_len,
3243 "The file to which the capture would be saved (\"%s\") "
3244 "could not be opened: %s.", capfile_name,
3247 g_free(capfile_name);
3251 if(capture_opts->save_file != NULL) {
3252 g_free(capture_opts->save_file);
3254 capture_opts->save_file = capfile_name;
3255 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
3256 "g_free(capfile_name)". */
3262 /* Do the work of handling either the file size or file duration capture
3263 conditions being reached, and switching files or stopping. */
3265 do_file_switch_or_stop(capture_options *capture_opts,
3266 condition *cnd_autostop_files,
3267 condition *cnd_autostop_size,
3268 condition *cnd_file_duration)
3271 pcap_options *pcap_opts;
3272 interface_options interface_opts;
3273 gboolean successful;
3275 if (capture_opts->multi_files_on) {
3276 if (cnd_autostop_files != NULL &&
3277 cnd_eval(cnd_autostop_files, ++global_ld.autostop_files)) {
3278 /* no files left: stop here */
3279 global_ld.go = FALSE;
3283 /* Switch to the next ringbuffer file */
3284 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
3285 &global_ld.save_file_fd, &global_ld.err)) {
3287 /* File switch succeeded: reset the conditions */
3288 global_ld.bytes_written = 0;
3289 if (capture_opts->use_pcapng) {
3291 GString *os_info_str;
3293 os_info_str = g_string_new("");
3294 get_os_version_info(os_info_str);
3296 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
3297 successful = libpcap_write_session_header_block(global_ld.pdh,
3300 os_info_str->str, /* OS */
3302 -1, /* section_length */
3303 &(global_ld.bytes_written),
3306 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
3307 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3308 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3309 successful = libpcap_write_interface_description_block(global_ld.pdh,
3310 NULL, /* OPT_COMMENT 1 */
3311 interface_opts.name, /* IDB_NAME 2 */
3312 interface_opts.descr, /* IDB_DESCRIPTION 3 */
3313 interface_opts.cfilter, /* IDB_FILTER 11 */
3314 os_info_str->str, /* IDB_OS 12 */
3315 pcap_opts->linktype,
3317 &(global_ld.bytes_written),
3318 0, /* IDB_IF_SPEED 8 */
3319 pcap_opts->ts_nsec ? 9 : 6, /* IDB_TSRESOL 9 */
3323 g_string_free(os_info_str, TRUE);
3326 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
3327 successful = libpcap_write_file_header(global_ld.pdh, pcap_opts->linktype, pcap_opts->snaplen,
3328 pcap_opts->ts_nsec, &global_ld.bytes_written, &global_ld.err);
3331 fclose(global_ld.pdh);
3332 global_ld.pdh = NULL;
3333 global_ld.go = FALSE;
3336 if (cnd_autostop_size)
3337 cnd_reset(cnd_autostop_size);
3338 if (cnd_file_duration)
3339 cnd_reset(cnd_file_duration);
3340 libpcap_dump_flush(global_ld.pdh, NULL);
3342 report_packet_count(global_ld.inpkts_to_sync_pipe);
3343 global_ld.inpkts_to_sync_pipe = 0;
3344 report_new_capture_file(capture_opts->save_file);
3346 /* File switch failed: stop here */
3347 global_ld.go = FALSE;
3351 /* single file, stop now */
3352 global_ld.go = FALSE;
3359 pcap_read_handler(void* arg)
3361 pcap_options *pcap_opts;
3362 char errmsg[MSG_MAX_LENGTH+1];
3364 pcap_opts = (pcap_options *)arg;
3366 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Started thread for interface %d.",
3367 pcap_opts->interface_id);
3369 while (global_ld.go) {
3370 /* dispatch incoming packets */
3371 capture_loop_dispatch(&global_ld, errmsg, sizeof(errmsg), pcap_opts);
3373 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Stopped thread for interface %d.",
3374 pcap_opts->interface_id);
3375 g_thread_exit(NULL);
3379 /* Do the low-level work of a capture.
3380 Returns TRUE if it succeeds, FALSE otherwise. */
3382 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
3385 DWORD upd_time, cur_time; /* GetTickCount() returns a "DWORD" (which is 'unsigned long') */
3387 struct timeval upd_time, cur_time;
3391 condition *cnd_file_duration = NULL;
3392 condition *cnd_autostop_files = NULL;
3393 condition *cnd_autostop_size = NULL;
3394 condition *cnd_autostop_duration = NULL;
3397 gboolean cfilter_error = FALSE;
3398 char errmsg[MSG_MAX_LENGTH+1];
3399 char secondary_errmsg[MSG_MAX_LENGTH+1];
3400 pcap_options *pcap_opts;
3401 interface_options interface_opts;
3402 guint i, error_index = 0;
3405 *secondary_errmsg = '\0';
3407 /* init the loop data */
3408 global_ld.go = TRUE;
3409 global_ld.packet_count = 0;
3411 global_ld.report_packet_count = FALSE;
3413 if (capture_opts->has_autostop_packets)
3414 global_ld.packet_max = capture_opts->autostop_packets;
3416 global_ld.packet_max = 0; /* no limit */
3417 global_ld.inpkts_to_sync_pipe = 0;
3418 global_ld.err = 0; /* no error seen yet */
3419 global_ld.pdh = NULL;
3420 global_ld.autostop_files = 0;
3421 global_ld.save_file_fd = -1;
3423 /* We haven't yet gotten the capture statistics. */
3424 *stats_known = FALSE;
3426 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
3427 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
3429 /* open the "input file" from network interface or capture pipe */
3430 if (!capture_loop_open_input(capture_opts, &global_ld, errmsg, sizeof(errmsg),
3431 secondary_errmsg, sizeof(secondary_errmsg))) {
3434 for (i = 0; i < capture_opts->ifaces->len; i++) {
3435 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3436 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3437 /* init the input filter from the network interface (capture pipe will do nothing) */
3439 * When remote capturing WinPCap crashes when the capture filter
3440 * is NULL. This might be a bug in WPCap. Therefore we provide an empty
3443 switch (capture_loop_init_filter(pcap_opts->pcap_h, pcap_opts->from_cap_pipe,
3444 interface_opts.name,
3445 interface_opts.cfilter?interface_opts.cfilter:"")) {
3447 case INITFILTER_NO_ERROR:
3450 case INITFILTER_BAD_FILTER:
3451 cfilter_error = TRUE;
3453 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(pcap_opts->pcap_h));
3456 case INITFILTER_OTHER_ERROR:
3457 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
3458 pcap_geterr(pcap_opts->pcap_h));
3459 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
3464 /* If we're supposed to write to a capture file, open it for output
3465 (temporary/specified name/ringbuffer) */
3466 if (capture_opts->saving_to_file) {
3467 if (!capture_loop_open_output(capture_opts, &global_ld.save_file_fd,
3468 errmsg, sizeof(errmsg))) {
3472 /* set up to write to the already-opened capture output file/files */
3473 if (!capture_loop_init_output(capture_opts, &global_ld, errmsg,
3478 /* XXX - capture SIGTERM and close the capture, in case we're on a
3479 Linux 2.0[.x] system and you have to explicitly close the capture
3480 stream in order to turn promiscuous mode off? We need to do that
3481 in other places as well - and I don't think that works all the
3482 time in any case, due to libpcap bugs. */
3484 /* Well, we should be able to start capturing.
3486 Sync out the capture file, so the header makes it to the file system,
3487 and send a "capture started successfully and capture file created"
3488 message to our parent so that they'll open the capture file and
3489 update its windows to indicate that we have a live capture in
3491 libpcap_dump_flush(global_ld.pdh, NULL);
3492 report_new_capture_file(capture_opts->save_file);
3495 /* initialize capture stop (and alike) conditions */
3496 init_capture_stop_conditions();
3497 /* create stop conditions */
3498 if (capture_opts->has_autostop_filesize)
3500 cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize * 1024);
3501 if (capture_opts->has_autostop_duration)
3502 cnd_autostop_duration =
3503 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
3505 if (capture_opts->multi_files_on) {
3506 if (capture_opts->has_file_duration)
3508 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
3510 if (capture_opts->has_autostop_files)
3511 cnd_autostop_files =
3512 cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
3515 /* init the time values */
3517 upd_time = GetTickCount();
3519 gettimeofday(&upd_time, NULL);
3521 start_time = create_timestamp();
3522 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running!");
3524 /* WOW, everything is prepared! */
3525 /* please fasten your seat belts, we will enter now the actual capture loop */
3527 pcap_queue = g_async_queue_new();
3528 pcap_queue_bytes = 0;
3529 pcap_queue_packets = 0;
3530 for (i = 0; i < global_ld.pcaps->len; i++) {
3531 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3532 #if GLIB_CHECK_VERSION(2,31,0)
3533 /* XXX - Add an interface name here? */
3534 pcap_opts->tid = g_thread_new("Capture read", pcap_read_handler, pcap_opts);
3536 pcap_opts->tid = g_thread_create(pcap_read_handler, pcap_opts, TRUE, NULL);
3540 while (global_ld.go) {
3541 /* dispatch incoming packets */
3543 pcap_queue_element *queue_element;
3544 #if GLIB_CHECK_VERSION(2,31,18)
3546 g_async_queue_lock(pcap_queue);
3547 queue_element = g_async_queue_timeout_pop_unlocked(pcap_queue, WRITER_THREAD_TIMEOUT);
3549 GTimeVal write_thread_time;
3551 g_get_current_time(&write_thread_time);
3552 g_time_val_add(&write_thread_time, WRITER_THREAD_TIMEOUT);
3553 g_async_queue_lock(pcap_queue);
3554 queue_element = g_async_queue_timed_pop_unlocked(pcap_queue, &write_thread_time);
3556 if (queue_element) {
3557 pcap_queue_bytes -= queue_element->phdr.caplen;
3558 pcap_queue_packets -= 1;
3560 g_async_queue_unlock(pcap_queue);
3561 if (queue_element) {
3562 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3563 "Dequeued a packet of length %d captured on interface %d.",
3564 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3566 capture_loop_write_packet_cb((u_char *) queue_element->pcap_opts,
3567 &queue_element->phdr,
3569 g_free(queue_element->pd);
3570 g_free(queue_element);
3576 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
3577 inpkts = capture_loop_dispatch(&global_ld, errmsg,
3578 sizeof(errmsg), pcap_opts);
3581 /* Were we asked to print packet counts by the SIGINFO handler? */
3582 if (global_ld.report_packet_count) {
3583 fprintf(stderr, "%u packet%s captured\n", global_ld.packet_count,
3584 plurality(global_ld.packet_count, "", "s"));
3585 global_ld.report_packet_count = FALSE;
3590 /* any news from our parent (signal pipe)? -> just stop the capture */
3591 if (!signal_pipe_check_running()) {
3592 global_ld.go = FALSE;
3597 global_ld.inpkts_to_sync_pipe += inpkts;
3599 /* check capture size condition */
3600 if (cnd_autostop_size != NULL &&
3601 cnd_eval(cnd_autostop_size, (guint32)global_ld.bytes_written)) {
3602 /* Capture size limit reached, do we have another file? */
3603 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3604 cnd_autostop_size, cnd_file_duration))
3606 } /* cnd_autostop_size */
3607 if (capture_opts->output_to_pipe) {
3608 libpcap_dump_flush(global_ld.pdh, NULL);
3612 /* Only update once every 500ms so as not to overload slow displays.
3613 * This also prevents too much context-switching between the dumpcap
3614 * and wireshark processes.
3616 #define DUMPCAP_UPD_TIME 500
3619 cur_time = GetTickCount(); /* Note: wraps to 0 if sys runs for 49.7 days */
3620 if ((cur_time - upd_time) > DUMPCAP_UPD_TIME) { /* wrap just causes an extra update */
3622 gettimeofday(&cur_time, NULL);
3623 if ((cur_time.tv_sec * 1000000 + cur_time.tv_usec) >
3624 (upd_time.tv_sec * 1000000 + upd_time.tv_usec + DUMPCAP_UPD_TIME*1000)) {
3627 upd_time = cur_time;
3630 if (pcap_stats(pch, stats) >= 0) {
3631 *stats_known = TRUE;
3634 /* Let the parent process know. */
3635 if (global_ld.inpkts_to_sync_pipe) {
3637 libpcap_dump_flush(global_ld.pdh, NULL);
3639 /* Send our parent a message saying we've written out
3640 "global_ld.inpkts_to_sync_pipe" packets to the capture file. */
3642 report_packet_count(global_ld.inpkts_to_sync_pipe);
3644 global_ld.inpkts_to_sync_pipe = 0;
3647 /* check capture duration condition */
3648 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
3649 /* The maximum capture time has elapsed; stop the capture. */
3650 global_ld.go = FALSE;
3654 /* check capture file duration condition */
3655 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
3656 /* duration limit reached, do we have another file? */
3657 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3658 cnd_autostop_size, cnd_file_duration))
3660 } /* cnd_file_duration */
3664 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
3666 pcap_queue_element *queue_element;
3668 for (i = 0; i < global_ld.pcaps->len; i++) {
3669 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3670 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Waiting for thread of interface %u...",
3671 pcap_opts->interface_id);
3672 g_thread_join(pcap_opts->tid);
3673 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Thread of interface %u terminated.",
3674 pcap_opts->interface_id);
3677 g_async_queue_lock(pcap_queue);
3678 queue_element = g_async_queue_try_pop_unlocked(pcap_queue);
3679 if (queue_element) {
3680 pcap_queue_bytes -= queue_element->phdr.caplen;
3681 pcap_queue_packets -= 1;
3683 g_async_queue_unlock(pcap_queue);
3684 if (queue_element == NULL) {
3687 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3688 "Dequeued a packet of length %d captured on interface %d.",
3689 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3690 capture_loop_write_packet_cb((u_char *)queue_element->pcap_opts,
3691 &queue_element->phdr,
3693 g_free(queue_element->pd);
3694 g_free(queue_element);
3695 global_ld.inpkts_to_sync_pipe += 1;
3696 if (capture_opts->output_to_pipe) {
3697 libpcap_dump_flush(global_ld.pdh, NULL);
3703 /* delete stop conditions */
3704 if (cnd_file_duration != NULL)
3705 cnd_delete(cnd_file_duration);
3706 if (cnd_autostop_files != NULL)
3707 cnd_delete(cnd_autostop_files);
3708 if (cnd_autostop_size != NULL)
3709 cnd_delete(cnd_autostop_size);
3710 if (cnd_autostop_duration != NULL)
3711 cnd_delete(cnd_autostop_duration);
3713 /* did we have a pcap (input) error? */
3714 for (i = 0; i < capture_opts->ifaces->len; i++) {
3715 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3716 if (pcap_opts->pcap_err) {
3717 /* On Linux, if an interface goes down while you're capturing on it,
3718 you'll get a "recvfrom: Network is down" or
3719 "The interface went down" error (ENETDOWN).
3720 (At least you will if g_strerror() doesn't show a local translation
3723 On FreeBSD and OS X, if a network adapter disappears while
3724 you're capturing on it, you'll get a "read: Device not configured"
3725 error (ENXIO). (See previous parenthetical note.)
3727 On OpenBSD, you get "read: I/O error" (EIO) in the same case.
3729 These should *not* be reported to the Wireshark developers. */
3732 cap_err_str = pcap_geterr(pcap_opts->pcap_h);
3733 if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
3734 strcmp(cap_err_str, "The interface went down") == 0 ||
3735 strcmp(cap_err_str, "read: Device not configured") == 0 ||
3736 strcmp(cap_err_str, "read: I/O error") == 0 ||
3737 strcmp(cap_err_str, "read error: PacketReceivePacket failed") == 0) {
3738 report_capture_error("The network adapter on which the capture was being done "
3739 "is no longer running; the capture has stopped.",
3742 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
3744 report_capture_error(errmsg, please_report);
3747 } else if (pcap_opts->from_cap_pipe && pcap_opts->cap_pipe_err == PIPERR) {
3748 report_capture_error(errmsg, "");
3752 /* did we have an output error while capturing? */
3753 if (global_ld.err == 0) {
3756 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file,
3757 global_ld.err, FALSE);
3758 report_capture_error(errmsg, please_report);
3762 if (capture_opts->saving_to_file) {
3763 /* close the output file */
3764 close_ok = capture_loop_close_output(capture_opts, &global_ld, &err_close);
3768 /* there might be packets not yet notified to the parent */
3769 /* (do this after closing the file, so all packets are already flushed) */
3770 if(global_ld.inpkts_to_sync_pipe) {
3772 report_packet_count(global_ld.inpkts_to_sync_pipe);
3773 global_ld.inpkts_to_sync_pipe = 0;
3776 /* If we've displayed a message about a write error, there's no point
3777 in displaying another message about an error on close. */
3778 if (!close_ok && write_ok) {
3779 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
3781 report_capture_error(errmsg, "");
3785 * XXX We exhibit different behaviour between normal mode and sync mode
3786 * when the pipe is stdin and not already at EOF. If we're a child, the
3787 * parent's stdin isn't closed, so if the user starts another capture,
3788 * cap_pipe_open_live() will very likely not see the expected magic bytes and
3789 * will say "Unrecognized libpcap format". On the other hand, in normal
3790 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
3793 report_capture_count(TRUE);
3795 /* get packet drop statistics from pcap */
3796 for (i = 0; i < capture_opts->ifaces->len; i++) {
3800 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3801 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3802 received = pcap_opts->received;
3803 dropped = pcap_opts->dropped;
3804 if (pcap_opts->pcap_h != NULL) {
3805 g_assert(!pcap_opts->from_cap_pipe);
3806 /* Get the capture statistics, so we know how many packets were dropped. */
3807 if (pcap_stats(pcap_opts->pcap_h, stats) >= 0) {
3808 *stats_known = TRUE;
3809 /* Let the parent process know. */
3810 dropped += stats->ps_drop;
3812 g_snprintf(errmsg, sizeof(errmsg),
3813 "Can't get packet-drop statistics: %s",
3814 pcap_geterr(pcap_opts->pcap_h));
3815 report_capture_error(errmsg, please_report);
3818 report_packet_drops(received, dropped, interface_opts.name);
3821 /* close the input file (pcap or capture pipe) */
3822 capture_loop_close_input(&global_ld);
3824 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped!");
3826 /* ok, if the write and the close were successful. */
3827 return write_ok && close_ok;
3830 if (capture_opts->multi_files_on) {
3831 /* cleanup ringbuffer */
3832 ringbuf_error_cleanup();
3834 /* We can't use the save file, and we have no FILE * for the stream
3835 to close in order to close it, so close the FD directly. */
3836 if (global_ld.save_file_fd != -1) {
3837 ws_close(global_ld.save_file_fd);
3840 /* We couldn't even start the capture, so get rid of the capture
3842 if (capture_opts->save_file != NULL) {
3843 ws_unlink(capture_opts->save_file);
3844 g_free(capture_opts->save_file);
3847 capture_opts->save_file = NULL;
3849 report_cfilter_error(capture_opts, error_index, errmsg);
3851 report_capture_error(errmsg, secondary_errmsg);
3853 /* close the input file (pcap or cap_pipe) */
3854 capture_loop_close_input(&global_ld);
3856 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
3862 static void capture_loop_stop(void)
3864 #ifdef HAVE_PCAP_BREAKLOOP
3866 pcap_options *pcap_opts;
3868 for (i = 0; i < global_ld.pcaps->len; i++) {
3869 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3870 if (pcap_opts->pcap_h != NULL)
3871 pcap_breakloop(pcap_opts->pcap_h);
3874 global_ld.go = FALSE;
3879 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
3880 int err, gboolean is_close)
3885 g_snprintf(errmsg, errmsglen,
3886 "Not all the packets could be written to the file"
3887 " to which the capture was being saved\n"
3888 "(\"%s\") because there is no space left on the file system\n"
3889 "on which that file resides.",
3895 g_snprintf(errmsg, errmsglen,
3896 "Not all the packets could be written to the file"
3897 " to which the capture was being saved\n"
3898 "(\"%s\") because you are too close to, or over,"
3899 " your disk quota\n"
3900 "on the file system on which that file resides.",
3907 g_snprintf(errmsg, errmsglen,
3908 "The file to which the capture was being saved\n"
3909 "(\"%s\") could not be closed: %s.",
3910 fname, g_strerror(err));
3912 g_snprintf(errmsg, errmsglen,
3913 "An error occurred while writing to the file"
3914 " to which the capture was being saved\n"
3916 fname, g_strerror(err));
3923 /* one packet was captured, process it */
3925 capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3928 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3930 guint ts_mul = pcap_opts->ts_nsec ? 1000000000 : 1000000;
3932 /* We may be called multiple times from pcap_dispatch(); if we've set
3933 the "stop capturing" flag, ignore this packet, as we're not
3934 supposed to be saving any more packets. */
3935 if (!global_ld.go) {
3936 pcap_opts->dropped++;
3940 if (global_ld.pdh) {
3941 gboolean successful;
3943 /* We're supposed to write the packet to a file; do so.
3944 If this fails, set "ld->go" to FALSE, to stop the capture, and set
3945 "ld->err" to the error. */
3946 if (global_capture_opts.use_pcapng) {
3947 successful = libpcap_write_enhanced_packet_block(global_ld.pdh, phdr, pcap_opts->interface_id, ts_mul, pd, &global_ld.bytes_written, &err);
3949 successful = libpcap_write_packet(global_ld.pdh, phdr, pd, &global_ld.bytes_written, &err);
3952 global_ld.go = FALSE;
3953 global_ld.err = err;
3954 pcap_opts->dropped++;
3956 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3957 "Wrote a packet of length %d captured on interface %u.",
3958 phdr->caplen, pcap_opts->interface_id);
3959 global_ld.packet_count++;
3960 pcap_opts->received++;
3961 /* if the user told us to stop after x packets, do we already have enough? */
3962 if ((global_ld.packet_max > 0) && (global_ld.packet_count >= global_ld.packet_max)) {
3963 global_ld.go = FALSE;
3969 /* one packet was captured, queue it */
3971 capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3974 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3975 pcap_queue_element *queue_element;
3976 gboolean limit_reached;
3978 /* We may be called multiple times from pcap_dispatch(); if we've set
3979 the "stop capturing" flag, ignore this packet, as we're not
3980 supposed to be saving any more packets. */
3981 if (!global_ld.go) {
3982 pcap_opts->dropped++;
3986 queue_element = (pcap_queue_element *)g_malloc(sizeof(pcap_queue_element));
3987 if (queue_element == NULL) {
3988 pcap_opts->dropped++;
3991 queue_element->pcap_opts = pcap_opts;
3992 queue_element->phdr = *phdr;
3993 queue_element->pd = (u_char *)g_malloc(phdr->caplen);
3994 if (queue_element->pd == NULL) {
3995 pcap_opts->dropped++;
3996 g_free(queue_element);
3999 memcpy(queue_element->pd, pd, phdr->caplen);
4000 g_async_queue_lock(pcap_queue);
4001 if (((pcap_queue_byte_limit > 0) && (pcap_queue_bytes < pcap_queue_byte_limit)) &&
4002 ((pcap_queue_packet_limit > 0) && (pcap_queue_packets < pcap_queue_packet_limit))) {
4003 limit_reached = FALSE;
4004 g_async_queue_push_unlocked(pcap_queue, queue_element);
4005 pcap_queue_bytes += phdr->caplen;
4006 pcap_queue_packets += 1;
4008 limit_reached = TRUE;
4010 g_async_queue_unlock(pcap_queue);
4011 if (limit_reached) {
4012 pcap_opts->dropped++;
4013 g_free(queue_element->pd);
4014 g_free(queue_element);
4015 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4016 "Dropped a packet of length %d captured on interface %u.",
4017 phdr->caplen, pcap_opts->interface_id);
4019 pcap_opts->received++;
4020 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4021 "Queued a packet of length %d captured on interface %u.",
4022 phdr->caplen, pcap_opts->interface_id);
4024 /* I don't want to hold the mutex over the debug output. So the
4025 output may be wrong */
4026 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4027 "Queue size is now %" G_GINT64_MODIFIER "d bytes (%" G_GINT64_MODIFIER "d packets)",
4028 pcap_queue_bytes, pcap_queue_packets);
4032 set_80211_channel(const char *iface, const char *opt)
4034 int freq = 0, type, ret;
4035 gchar **options = NULL;
4036 options = g_strsplit_set(opt, ",", 2);
4039 freq = atoi(options[0]);
4042 type = ws80211_str_to_chan_type(options[1]);
4051 ret = ws80211_init();
4053 cmdarg_err("%d: Failed to init ws80211: %s\n", abs(ret), g_strerror(abs(ret)));
4057 ret = ws80211_set_freq(iface, freq, type);
4060 cmdarg_err("%d: Failed to set channel: %s\n", abs(ret), g_strerror(abs(ret)));
4066 pipe_write_block(2, SP_SUCCESS, NULL);
4070 g_strfreev(options);
4074 /* And now our feature presentation... [ fade to music ] */
4076 main(int argc, char *argv[])
4079 gboolean arg_error = FALSE;
4084 struct sigaction action, oldaction;
4087 gboolean start_capture = TRUE;
4088 gboolean stats_known;
4089 struct pcap_stat stats;
4090 GLogLevelFlags log_flags;
4091 gboolean list_interfaces = FALSE;
4092 gboolean list_link_layer_types = FALSE;
4093 #ifdef HAVE_BPF_IMAGE
4094 gboolean print_bpf_code = FALSE;
4096 gboolean set_chan = FALSE;
4097 gchar *set_chan_arg = NULL;
4098 gboolean machine_readable = FALSE;
4099 gboolean print_statistics = FALSE;
4100 int status, run_once_args = 0;
4103 #if defined(__APPLE__) && defined(__LP64__)
4104 struct utsname osinfo;
4109 arg_list_utf_16to8(argc, argv);
4114 * Initialize our DLL search path. MUST be called before LoadLibrary
4117 ws_init_dll_search_path();
4120 #ifdef HAVE_PCAP_REMOTE
4121 #define OPTSTRING_A "A:"
4122 #define OPTSTRING_r "r"
4123 #define OPTSTRING_u "u"
4125 #define OPTSTRING_A ""
4126 #define OPTSTRING_r ""
4127 #define OPTSTRING_u ""
4130 #ifdef HAVE_PCAP_SETSAMPLING
4131 #define OPTSTRING_m "m:"
4133 #define OPTSTRING_m ""
4136 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
4137 #define OPTSTRING_B "B:"
4139 #define OPTSTRING_B ""
4140 #endif /* _WIN32 or HAVE_PCAP_CREATE */
4142 #ifdef HAVE_PCAP_CREATE
4143 #define OPTSTRING_I "I"
4145 #define OPTSTRING_I ""
4148 #ifdef HAVE_BPF_IMAGE
4149 #define OPTSTRING_d "d"
4151 #define OPTSTRING_d ""
4154 #define OPTSTRING "a:" OPTSTRING_A "b:" OPTSTRING_B "c:" OPTSTRING_d "Df:ghi:" OPTSTRING_I "k:L" OPTSTRING_m "MnpPq" OPTSTRING_r "Ss:t" OPTSTRING_u "vw:y:Z:"
4156 #ifdef DEBUG_CHILD_DUMPCAP
4157 if ((debug_log = ws_fopen("dumpcap_debug_log.tmp","w")) == NULL) {
4158 fprintf (stderr, "Unable to open debug log file !\n");
4163 #if defined(__APPLE__) && defined(__LP64__)
4165 * Is this Mac OS X 10.6.0, 10.6.1, 10.6.3, or 10.6.4? If so, we need
4166 * a bug workaround - timeouts less than 1 second don't work with libpcap
4167 * in 64-bit code. (The bug was introduced in 10.6, fixed in 10.6.2,
4168 * re-introduced in 10.6.3, not fixed in 10.6.4, and fixed in 10.6.5.
4169 * The problem is extremely unlikely to be reintroduced in a future
4172 if (uname(&osinfo) == 0) {
4174 * Mac OS X 10.x uses Darwin {x+4}.0.0. Mac OS X 10.x.y uses Darwin
4175 * {x+4}.y.0 (except that 10.6.1 appears to have a uname version
4176 * number of 10.0.0, not 10.1.0 - go figure).
4178 if (strcmp(osinfo.release, "10.0.0") == 0 || /* 10.6, 10.6.1 */
4179 strcmp(osinfo.release, "10.3.0") == 0 || /* 10.6.3 */
4180 strcmp(osinfo.release, "10.4.0") == 0) /* 10.6.4 */
4181 need_timeout_workaround = TRUE;
4186 * Determine if dumpcap is being requested to run in a special
4187 * capture_child mode by going thru the command line args to see if
4188 * a -Z is present. (-Z is a hidden option).
4190 * The primary result of running in capture_child mode is that
4191 * all messages sent out on stderr are in a special type/len/string
4192 * format to allow message processing by type. These messages include
4193 * error messages if dumpcap fails to start the operation it was
4194 * requested to do, as well as various "status" messages which are sent
4195 * when an actual capture is in progress, and a "success" message sent
4196 * if dumpcap was requested to perform an operation other than a
4199 * Capture_child mode would normally be requested by a parent process
4200 * which invokes dumpcap and obtains dumpcap stderr output via a pipe
4201 * to which dumpcap stderr has been redirected. It might also have
4202 * another pipe to obtain dumpcap stdout output; for operations other
4203 * than a capture, that information is formatted specially for easier
4204 * parsing by the parent process.
4206 * Capture_child mode needs to be determined immediately upon
4207 * startup so that any messages generated by dumpcap in this mode
4208 * (eg: during initialization) will be formatted properly.
4211 for (i=1; i<argc; i++) {
4212 if (strcmp("-Z", argv[i]) == 0) {
4213 capture_child = TRUE;
4214 machine_readable = TRUE; /* request machine-readable output */
4216 /* set output pipe to binary mode, to avoid ugly text conversions */
4217 _setmode(2, O_BINARY);
4222 /* The default_log_handler will use stdout, which makes trouble in */
4223 /* capture child mode, as it uses stdout for it's sync_pipe. */
4224 /* So: the filtering is done in the console_log_handler and not here.*/
4225 /* We set the log handlers right up front to make sure that any log */
4226 /* messages when running as child will be sent back to the parent */
4227 /* with the correct format. */
4231 G_LOG_LEVEL_CRITICAL|
4232 G_LOG_LEVEL_WARNING|
4233 G_LOG_LEVEL_MESSAGE|
4236 G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
4238 g_log_set_handler(NULL,
4240 console_log_handler, NULL /* user_data */);
4241 g_log_set_handler(LOG_DOMAIN_MAIN,
4243 console_log_handler, NULL /* user_data */);
4244 g_log_set_handler(LOG_DOMAIN_CAPTURE,
4246 console_log_handler, NULL /* user_data */);
4247 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
4249 console_log_handler, NULL /* user_data */);
4251 /* Initialize the pcaps list */
4252 global_ld.pcaps = g_array_new(FALSE, FALSE, sizeof(pcap_options *));
4254 #if !GLIB_CHECK_VERSION(2,31,0)
4255 /* Initialize the thread system */
4256 g_thread_init(NULL);
4260 /* Load wpcap if possible. Do this before collecting the run-time version information */
4263 /* ... and also load the packet.dll from wpcap */
4264 /* XXX - currently not required, may change later. */
4265 /*wpcap_packet_load();*/
4267 /* Start windows sockets */
4268 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
4270 /* Set handler for Ctrl+C key */
4271 SetConsoleCtrlHandler(capture_cleanup_handler, TRUE);
4273 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
4274 and exit. Do the same with SIGPIPE, in case, for example,
4275 we're writing to our standard output and it's a pipe.
4276 Do the same with SIGHUP if it's not being ignored (if we're
4277 being run under nohup, it might be ignored, in which case we
4278 should leave it ignored).
4280 XXX - apparently, Coverity complained that part of action
4281 wasn't initialized. Perhaps it's running on Linux, where
4282 struct sigaction has an ignored "sa_restorer" element and
4283 where "sa_handler" and "sa_sigaction" might not be two
4284 members of a union. */
4285 memset(&action, 0, sizeof(action));
4286 action.sa_handler = capture_cleanup_handler;
4288 * Arrange that system calls not get restarted, because when
4289 * our signal handler returns we don't want to restart
4290 * a call that was waiting for packets to arrive.
4292 action.sa_flags = 0;
4293 sigemptyset(&action.sa_mask);
4294 sigaction(SIGTERM, &action, NULL);
4295 sigaction(SIGINT, &action, NULL);
4296 sigaction(SIGPIPE, &action, NULL);
4297 sigaction(SIGHUP, NULL, &oldaction);
4298 if (oldaction.sa_handler == SIG_DFL)
4299 sigaction(SIGHUP, &action, NULL);
4302 /* Catch SIGINFO and, if we get it and we're capturing in
4303 quiet mode, report the number of packets we've captured. */
4304 action.sa_handler = report_counts_siginfo;
4305 action.sa_flags = SA_RESTART;
4306 sigemptyset(&action.sa_mask);
4307 sigaction(SIGINFO, &action, NULL);
4308 #endif /* SIGINFO */
4311 /* ----------------------------------------------------------------- */
4312 /* Privilege and capability handling */
4314 /* 1. Running not as root or suid root; no special capabilities. */
4317 /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
4320 /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
4322 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
4323 /* capabilities; Drop all other capabilities; */
4324 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4325 /* else: after pcap_open_live() in capture_loop_open_input() */
4326 /* drop all capabilities (NET_RAW and NET_ADMIN); */
4327 /* (Note: this means that the process, although logged in */
4328 /* as root, does not have various permissions such as the */
4329 /* ability to bypass file access permissions). */
4330 /* XXX: Should we just leave capabilities alone in this case */
4331 /* so that user gets expected effect that root can do */
4334 /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
4336 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4337 /* else: after pcap_open_live() in capture_loop_open_input() */
4338 /* drop suid root (set euid=ruid).(ie: keep suid until after */
4339 /* pcap_open_live). */
4341 /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
4343 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
4344 /* capabilities; Drop all other capabilities; */
4345 /* Drop suid privileges (euid=ruid); */
4346 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4347 /* else: after pcap_open_live() in capture_loop_open_input() */
4348 /* drop all capabilities (NET_RAW and NET_ADMIN). */
4350 /* XXX: For some Linux versions/distros with capabilities */
4351 /* a 'normal' process with any capabilities cannot be */
4352 /* 'killed' (signaled) from another (same uid) non-privileged */
4354 /* For example: If (non-suid) Wireshark forks a */
4355 /* child suid dumpcap which acts as described here (case 5), */
4356 /* Wireshark will be unable to kill (signal) the child */
4357 /* dumpcap process until the capabilities have been dropped */
4358 /* (after pcap_open_live()). */
4359 /* This behaviour will apparently be changed in the kernel */
4360 /* to allow the kill (signal) in this case. */
4361 /* See the following for details: */
4362 /* http://www.mail-archive.com/ [wrapped] */
4363 /* linux-security-module@vger.kernel.org/msg02913.html */
4365 /* It is therefore conceivable that if dumpcap somehow hangs */
4366 /* in pcap_open_live or before that wireshark will not */
4367 /* be able to stop dumpcap using a signal (INT, TERM, etc). */
4368 /* In this case, exiting wireshark will kill the child */
4369 /* dumpcap process. */
4371 /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
4372 /* capabilities; Using libcap. Note: capset cmd (which see) */
4373 /* used to assign capabilities to file. */
4375 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4376 /* else: after pcap_open_live() in capture_loop_open_input() */
4377 /* drop all capabilities (NET_RAW and NET_ADMIN) */
4379 /* ToDo: -S (stats) should drop privileges/capabilities when no */
4380 /* longer required (similar to capture). */
4382 /* ----------------------------------------------------------------- */
4384 init_process_policies();
4387 /* If 'started with special privileges' (and using libcap) */
4388 /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
4389 /* Set euid/egid = ruid/rgid to remove suid privileges */
4390 relinquish_privs_except_capture();
4393 /* Set the initial values in the capture options. This might be overwritten
4394 by the command line parameters. */
4395 capture_opts_init(&global_capture_opts, NULL);
4397 /* We always save to a file - if no file was specified, we save to a
4399 global_capture_opts.saving_to_file = TRUE;
4400 global_capture_opts.has_ring_num_files = TRUE;
4402 /* Now get our args */
4403 while ((opt = getopt(argc, argv, OPTSTRING)) != -1) {
4405 case 'h': /* Print help and exit */
4409 case 'v': /* Show version and exit */
4411 GString *comp_info_str;
4412 GString *runtime_info_str;
4413 /* Assemble the compile-time version information string */
4414 comp_info_str = g_string_new("Compiled ");
4415 get_compiled_version_info(comp_info_str, NULL, NULL);
4417 /* Assemble the run-time version information string */
4418 runtime_info_str = g_string_new("Running ");
4419 get_runtime_version_info(runtime_info_str, NULL);
4420 show_version(comp_info_str, runtime_info_str);
4421 g_string_free(comp_info_str, TRUE);
4422 g_string_free(runtime_info_str, TRUE);
4426 /*** capture option specific ***/
4427 case 'a': /* autostop criteria */
4428 case 'b': /* Ringbuffer option */
4429 case 'c': /* Capture x packets */
4430 case 'f': /* capture filter */
4431 case 'i': /* Use interface x */
4432 case 'n': /* Use pcapng format */
4433 case 'p': /* Don't capture in promiscuous mode */
4434 case 'P': /* Use pcap format */
4435 case 's': /* Set the snapshot (capture) length */
4436 case 'w': /* Write to capture file x */
4437 case 'g': /* enable group read accesson file(s) */
4438 case 'y': /* Set the pcap data link type */
4439 #ifdef HAVE_PCAP_REMOTE
4440 case 'u': /* Use UDP for data transfer */
4441 case 'r': /* Capture own RPCAP traffic too */
4442 case 'A': /* Authentication */
4444 #ifdef HAVE_PCAP_SETSAMPLING
4445 case 'm': /* Sampling */
4447 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
4448 case 'B': /* Buffer size */
4449 #endif /* _WIN32 or HAVE_PCAP_CREATE */
4450 #ifdef HAVE_PCAP_CREATE
4451 case 'I': /* Monitor mode */
4453 status = capture_opts_add_opt(&global_capture_opts, opt, optarg, &start_capture);
4458 /*** hidden option: Wireshark child mode (using binary output messages) ***/
4460 capture_child = TRUE;
4462 /* set output pipe to binary mode, to avoid ugly text conversions */
4463 _setmode(2, O_BINARY);
4465 * optarg = the control ID, aka the PPID, currently used for the
4468 if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
4469 sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
4470 sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
4471 GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
4473 if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
4474 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4475 "Signal pipe: Unable to open %s. Dead parent?",
4483 case 'q': /* Quiet */
4489 /*** all non capture option specific ***/
4490 case 'D': /* Print a list of capture devices and exit */
4491 list_interfaces = TRUE;
4494 case 'L': /* Print list of link-layer types and exit */
4495 list_link_layer_types = TRUE;
4498 #ifdef HAVE_BPF_IMAGE
4499 case 'd': /* Print BPF code for capture filter and exit */
4500 print_bpf_code = TRUE;
4504 case 'S': /* Print interface statistics once a second */
4505 print_statistics = TRUE;
4508 case 'k': /* Set wireless channel */
4510 set_chan_arg = optarg;
4513 case 'M': /* For -D, -L, and -S, print machine-readable output */
4514 machine_readable = TRUE;
4517 cmdarg_err("Invalid Option: %s", argv[optind-1]);
4519 case '?': /* Bad flag - print usage message */
4528 /* user specified file name as regular command-line argument */
4529 /* XXX - use it as the capture file name (or something else)? */
4535 * Extra command line arguments were specified; complain.
4536 * XXX - interpret as capture filter, as tcpdump and tshark do?
4538 cmdarg_err("Invalid argument: %s", argv[0]);
4548 if (run_once_args > 1) {
4549 cmdarg_err("Only one of -D, -L, or -S may be supplied.");
4551 } else if (run_once_args == 1) {
4552 /* We're supposed to print some information, rather than
4553 to capture traffic; did they specify a ring buffer option? */
4554 if (global_capture_opts.multi_files_on) {
4555 cmdarg_err("Ring buffer requested, but a capture isn't being done.");
4559 /* We're supposed to capture traffic; */
4560 /* Are we capturing on multiple interface? If so, use threads and pcapng. */
4561 if (global_capture_opts.ifaces->len > 1) {
4563 global_capture_opts.use_pcapng = TRUE;
4565 /* Was the ring buffer option specified and, if so, does it make sense? */
4566 if (global_capture_opts.multi_files_on) {
4567 /* Ring buffer works only under certain conditions:
4568 a) ring buffer does not work with temporary files;
4569 b) it makes no sense to enable the ring buffer if the maximum
4570 file size is set to "infinite". */
4571 if (global_capture_opts.save_file == NULL) {
4572 cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
4573 global_capture_opts.multi_files_on = FALSE;
4575 if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
4576 cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
4578 /* XXX - this must be redesigned as the conditions changed */
4579 global_capture_opts.multi_files_on = FALSE;
4586 * "-D" requires no interface to be selected; it's supposed to list
4589 if (list_interfaces) {
4590 /* Get the list of interfaces */
4595 if_list = capture_interface_list(&err, &err_str);
4596 if (if_list == NULL) {
4598 case CANT_GET_INTERFACE_LIST:
4599 case DONT_HAVE_PCAP:
4600 cmdarg_err("%s", err_str);
4605 case NO_INTERFACES_FOUND:
4607 * If we're being run by another program, just give them
4608 * an empty list of interfaces, don't report this as
4609 * an error; that lets them decide whether to report
4610 * this as an error or not.
4612 if (!machine_readable) {
4613 cmdarg_err("There are no interfaces on which a capture can be done");
4620 if (machine_readable) /* tab-separated values to stdout */
4621 print_machine_readable_interfaces(if_list);
4623 capture_opts_print_interfaces(if_list);
4624 free_interface_list(if_list);
4629 * "-S" requires no interface to be selected; it gives statistics
4630 * for all interfaces.
4632 if (print_statistics) {
4633 status = print_statistics_loop(machine_readable);
4638 interface_options interface_opts;
4640 if (global_capture_opts.ifaces->len != 1) {
4641 cmdarg_err("Need one interface");
4645 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, 0);
4646 status = set_80211_channel(interface_opts.name, set_chan_arg);
4651 * "-L", "-d", and capturing act on a particular interface, so we have to
4652 * have an interface; if none was specified, pick a default.
4654 if (capture_opts_trim_iface(&global_capture_opts, NULL) == FALSE) {
4655 /* cmdarg_err() already called .... */
4659 /* Let the user know what interfaces were chosen. */
4660 /* get_interface_descriptive_name() is not available! */
4661 if (capture_child) {
4662 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4663 interface_options interface_opts;
4665 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4666 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s\n",
4667 interface_opts.name);
4670 str = g_string_new("");
4672 if (global_capture_opts.ifaces->len < 2) {
4674 if (global_capture_opts.ifaces->len < 4) {
4676 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4677 interface_options interface_opts;
4679 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4681 if (global_capture_opts.ifaces->len > 2) {
4682 g_string_append_printf(str, ",");
4684 g_string_append_printf(str, " ");
4685 if (j == global_capture_opts.ifaces->len - 1) {
4686 g_string_append_printf(str, "and ");
4689 g_string_append_printf(str, "%s", interface_opts.name);
4692 g_string_append_printf(str, "%u interfaces", global_capture_opts.ifaces->len);
4694 fprintf(stderr, "Capturing on %s\n", str->str);
4695 g_string_free(str, TRUE);
4698 if (list_link_layer_types) {
4699 /* Get the list of link-layer types for the capture device. */
4700 if_capabilities_t *caps;
4704 for (i = 0; i < global_capture_opts.ifaces->len; i++) {
4705 interface_options interface_opts;
4707 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, i);
4708 caps = get_if_capabilities(interface_opts.name,
4709 interface_opts.monitor_mode, &err_str);
4711 cmdarg_err("The capabilities of the capture device \"%s\" could not be obtained (%s).\n"
4712 "Please check to make sure you have sufficient permissions, and that\n"
4713 "you have the proper interface or pipe specified.", interface_opts.name, err_str);
4717 if (caps->data_link_types == NULL) {
4718 cmdarg_err("The capture device \"%s\" has no data link types.", interface_opts.name);
4721 if (machine_readable) /* tab-separated values to stdout */
4722 /* XXX: We need to change the format and adopt consumers */
4723 print_machine_readable_if_capabilities(caps);
4725 /* XXX: We might want to print also the interface name */
4726 capture_opts_print_if_capabilities(caps, interface_opts.name,
4727 interface_opts.monitor_mode);
4728 free_if_capabilities(caps);
4733 /* We're supposed to do a capture, or print the BPF code for a filter.
4734 Process the snapshot length, as that affects the generated BPF code. */
4735 capture_opts_trim_snaplen(&global_capture_opts, MIN_PACKET_SIZE);
4737 #ifdef HAVE_BPF_IMAGE
4738 if (print_bpf_code) {
4739 show_filter_code(&global_capture_opts);
4744 /* We're supposed to do a capture. Process the ring buffer arguments. */
4745 capture_opts_trim_ring_num_files(&global_capture_opts);
4747 /* Now start the capture. */
4749 if(capture_loop_start(&global_capture_opts, &stats_known, &stats) == TRUE) {
4753 /* capture failed */
4756 return 0; /* never here, make compiler happy */
4761 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
4762 const char *message, gpointer user_data _U_)
4769 /* ignore log message, if log_level isn't interesting */
4770 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4771 #if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
4776 /* create a "timestamp" */
4778 today = localtime(&curr);
4780 switch(log_level & G_LOG_LEVEL_MASK) {
4781 case G_LOG_LEVEL_ERROR:
4784 case G_LOG_LEVEL_CRITICAL:
4787 case G_LOG_LEVEL_WARNING:
4790 case G_LOG_LEVEL_MESSAGE:
4793 case G_LOG_LEVEL_INFO:
4796 case G_LOG_LEVEL_DEBUG:
4800 fprintf(stderr, "unknown log_level %u\n", log_level);
4802 g_assert_not_reached();
4805 /* Generate the output message */
4806 if(log_level & G_LOG_LEVEL_MESSAGE) {
4807 /* normal user messages without additional infos */
4808 msg = g_strdup_printf("%s\n", message);
4810 /* info/debug messages with additional infos */
4811 msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
4812 today->tm_hour, today->tm_min, today->tm_sec,
4813 log_domain != NULL ? log_domain : "",
4817 /* DEBUG & INFO msgs (if we're debugging today) */
4818 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
4819 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4820 #ifdef DEBUG_DUMPCAP
4821 fprintf(stderr, "%s", msg);
4824 #ifdef DEBUG_CHILD_DUMPCAP
4825 fprintf(debug_log, "%s", msg);
4833 /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
4834 /* to parent especially formatted if dumpcap running as child. */
4835 if (capture_child) {
4836 sync_pipe_errmsg_to_parent(2, msg, "");
4838 fprintf(stderr, "%s", msg);
4845 /****************************************************************************************************************/
4846 /* indication report routines */
4850 report_packet_count(unsigned int packet_count)
4852 char tmp[SP_DECISIZE+1+1];
4853 static unsigned int count = 0;
4856 g_snprintf(tmp, sizeof(tmp), "%u", packet_count);
4857 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
4858 pipe_write_block(2, SP_PACKET_COUNT, tmp);
4860 count += packet_count;
4861 fprintf(stderr, "\rPackets: %u ", count);
4862 /* stderr could be line buffered */
4868 report_new_capture_file(const char *filename)
4871 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
4872 pipe_write_block(2, SP_FILE, filename);
4876 * Prevent a SIGINFO handler from writing to the standard error
4877 * while we're doing so; instead, have it just set a flag telling
4878 * us to print that information when we're done.
4881 #endif /* SIGINFO */
4882 fprintf(stderr, "File: %s\n", filename);
4883 /* stderr could be line buffered */
4888 * Allow SIGINFO handlers to write.
4893 * If a SIGINFO handler asked us to write out capture counts, do so.
4896 report_counts_for_siginfo();
4897 #endif /* SIGINFO */
4902 report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg)
4904 interface_options interface_opts;
4905 char tmp[MSG_MAX_LENGTH+1+6];
4907 if (i < capture_opts->ifaces->len) {
4908 if (capture_child) {
4909 g_snprintf(tmp, sizeof(tmp), "%u:%s", i, errmsg);
4910 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
4911 pipe_write_block(2, SP_BAD_FILTER, tmp);
4914 * clopts_step_invalid_capfilter in test/suite-clopts.sh MUST match
4915 * the error message below.
4917 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
4919 "Invalid capture filter: \"%s\" for interface %s!\n"
4921 "That string isn't a valid capture filter (%s).\n"
4922 "See the User's Guide for a description of the capture filter syntax.",
4923 interface_opts.cfilter, interface_opts.name, errmsg);
4929 report_capture_error(const char *error_msg, const char *secondary_error_msg)
4932 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4933 "Primary Error: %s", error_msg);
4934 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4935 "Secondary Error: %s", secondary_error_msg);
4936 sync_pipe_errmsg_to_parent(2, error_msg, secondary_error_msg);
4938 cmdarg_err("%s", error_msg);
4939 if (secondary_error_msg[0] != '\0')
4940 cmdarg_err_cont("%s", secondary_error_msg);
4945 report_packet_drops(guint32 received, guint32 drops, gchar *name)
4947 char tmp[SP_DECISIZE+1+1];
4949 g_snprintf(tmp, sizeof(tmp), "%u", drops);
4952 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4953 "Packets received/dropped on interface %s: %u/%u",
4954 name, received, drops);
4955 /* XXX: Need to provide interface id, changes to consumers required. */
4956 pipe_write_block(2, SP_DROPS, tmp);
4959 "Packets received/dropped on interface %s: %u/%u (%.1f%%)\n",
4960 name, received, drops,
4961 received ? 100.0 * received / (received + drops) : 0.0);
4962 /* stderr could be line buffered */
4968 /************************************************************************************************/
4969 /* signal_pipe handling */
4974 signal_pipe_check_running(void)
4976 /* any news from our parent? -> just stop the capture */
4980 /* if we are running standalone, no check required */
4981 if(!capture_child) {
4985 if(!sig_pipe_name || !sig_pipe_handle) {
4986 /* This shouldn't happen */
4987 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4988 "Signal pipe: No name or handle");
4993 * XXX - We should have the process ID of the parent (from the "-Z" flag)
4994 * at this point. Should we check to see if the parent is still alive,
4995 * e.g. by using OpenProcess?
4998 result = PeekNamedPipe(sig_pipe_handle, NULL, 0, NULL, &avail, NULL);
5000 if(!result || avail > 0) {
5001 /* peek failed or some bytes really available */
5002 /* (if not piping from stdin this would fail) */
5003 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
5004 "Signal pipe: Stop capture: %s", sig_pipe_name);
5005 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
5006 "Signal pipe: %s (%p) result: %u avail: %u", sig_pipe_name,
5007 sig_pipe_handle, result, avail);
5010 /* pipe ok and no bytes available */
5017 * Editor modelines - http://www.wireshark.org/tools/modelines.html
5022 * indent-tabs-mode: nil
5025 * vi: set shiftwidth=4 tabstop=8 expandtab:
5026 * :indentSize=4:tabSize=8:noTabs=true: